diff --git a/meta/definitions/email.php b/meta/definitions/email.php
new file mode 100644
index 0000000..22901ab
--- /dev/null
+++ b/meta/definitions/email.php
@@ -0,0 +1,24 @@
+<?php
+
+use function DI\autowire, DI\create, DI\get;
+
+use TheBugs\Email\EmailConfiguration,
+    TheBugs\Email\MailerInterface,
+    TheBugs\Email\SwiftMailer;
+
+return [
+    EmailConfiguration::class => function($c) {
+        $email = new EmailConfiguration( EmailConfiguration::AUTH_TYPE_SMTP );
+        $email->smtpHost = getenv('SMTP_HOST');
+        $email->smtpPort = getenv('SMTP_PORT');
+        $email->smtpUsername = getenv('SMTP_USERNAME');
+        $email->smtpPassword = getenv('SMTP_PASSWORD');
+        $email->smtpUseTLS = getenv('SMTP_TLS');
+        $email->toAddress = getenv("TO_EMAIL");
+        $email->fromAddress = getenv("FROM_EMAIL");
+        $email->fromName = getenv("FROM_NAME");
+        return $email;
+    },
+
+    MailerInterface::class => autowire(SwiftMailer::class),
+];
diff --git a/meta/i18n/en/lean.date.json b/meta/i18n/en/lean.date.json
new file mode 100644
index 0000000..2b61bd2
--- /dev/null
+++ b/meta/i18n/en/lean.date.json
@@ -0,0 +1,15 @@
+{
+  "month": {
+    "list": [
+      "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "Décember"
+    ],
+
+    "short": [
+      "Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sept", "Oct", "Nov", "Dec"
+    ],
+
+    "letter": [
+      "J", "F", "M", "A", "M", "J", "J", "A", "S", "O", "N", "D"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/meta/i18n/fr/lean.date.json b/meta/i18n/fr/lean.date.json
new file mode 100644
index 0000000..952dd05
--- /dev/null
+++ b/meta/i18n/fr/lean.date.json
@@ -0,0 +1,15 @@
+{
+  "month": {
+    "list": [
+      "Janvier", "Février", "Mars", "Avril", "Mai", "Juin", "Juillet", "Août", "Septembre", "Octobre", "Novembre", "Décembre"
+    ],
+
+    "short": [
+      "Jan", "Fév", "Mars", "Avr", "Mai", "Juin", "Jui", "Août", "Sept", "Oct", "Nov", "Déc"
+    ],
+
+    "letter": [
+      "J", "F", "M", "A", "M", "J", "J", "A", "S", "O", "N", "D"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/meta/i18n/fr/lean.error.json b/meta/i18n/fr/lean.error.json
index 45d1118..96329fe 100644
--- a/meta/i18n/fr/lean.error.json
+++ b/meta/i18n/fr/lean.error.json
@@ -5,5 +5,12 @@
     "subtitle": "Vous avez peut-être suivi un lien expiré ou invalide...",
     "message": "Il semblerait que l'action que vous avez tentez à mener vers une page qui n'existe pas / plus. Une notification a été envoyé au développeur de l'application.",
     "back": "Revenir à la page précédente"
+  },
+  "500": {
+    "title": "Une erreur semble s'être produite",
+    "page-title": "Une erreur semble s'être produite",
+    "subtitle": "L'action que vous avez tenté d'effectué semble avoir échoué.",
+    "message": "Un message d'erreur a été envoyé au développeur de cette application.",
+    "back": "Revenir à la page précédente"
   }
 }
\ No newline at end of file
diff --git a/skeleton/.env b/skeleton/.env
new file mode 100644
index 0000000..e11d9d8
--- /dev/null
+++ b/skeleton/.env
@@ -0,0 +1,43 @@
+APP_ENV = dev
+DEBUG = 1
+KEYS = "dev:dev"
+CRON_KEY = dev
+
+# Route
+URL_BASE = ""
+APP_URL = "dev.cslsj.qc.ca"
+
+# Path
+CACHE_DIR = "var/cache"
+META_DIR = "meta"
+LOGS_DIR = "var/logs"
+PUBLIC_DIR = "public"
+PRIVATE_DIR = "private"
+VIEW_DIR = "view"
+I18N_DIR = "i18n"
+
+DEFAULT_TIMEZONE = "America/Toronto"
+DEFAULT_LOCAL = "fr_CA.UTF-8"
+DEFAULT_TIME = "fr.UTF-8"
+DEFAULT_TIME_FALLBACK = "french.UTF-8"
+
+# MS Authentication
+# MS_OAUTH_CLIENT_ID = ""
+# MS_OAUTH_CLIENT_SECRET = ""
+
+# MS Graph
+# MS_GRAPH_CLIENT_ID = ""
+# MS_GRAPH_CLIENT_SECRET = ""
+# MS_GRAPH_ACCESS_TOKEN_URL = ""
+
+# Database
+DATABASE_PORT = "3306"
+DATABASE_HOST = "appsdb.cslsj.qc.ca"
+DATABASE_NAME = ""
+DATABASE_USERNAME = ""
+DATABASE_PASSWORD = ""
+DATABASE_CHARSET = "utf8"
+DATABASE_ADAPTER = "MariaDB"
+
+LEAN_RANDOM = "%RAND64%"
+
diff --git a/skeleton/meta/config.php b/skeleton/meta/config.php
new file mode 100644
index 0000000..a80eff1
--- /dev/null
+++ b/skeleton/meta/config.php
@@ -0,0 +1,40 @@
+<?php
+
+return [
+    'lean' => [
+        'autoload' => [
+            'lean.default',
+            getenv('DEBUG') ? 'lean.console' : null,
+            '%APPKEY%',
+        ],
+    ],
+
+    'keys' => (function() {
+        foreach(explode(',', getenv('KEYS') ?? "") as $item) {
+            list($var, $value) = explode(":", trim($item));
+            $list[$var] = $value;
+        }
+
+        return $list;
+    })(),
+
+    'meta' => [
+        'application_name' => "",
+    ],
+
+    'ulmus' => [
+        'connections' => [
+            'default' => [
+                'adapter'  => getenv("DATABASE_ADAPTER"),
+                'host'     => getenv("DATABASE_HOST"),
+                'port'     => getenv("DATABASE_PORT"),
+                'database' => getenv("DATABASE_NAME"),
+                'username' => getenv("DATABASE_USERNAME"),
+                'password' => getenv("DATABASE_PASSWORD"),
+                'settings' => [
+                    'charset' => getenv("DATABASE_CHARSET"),
+                ],
+            ],
+        ]
+    ]
+];
diff --git a/skeleton/meta/crontab.php b/skeleton/meta/crontab.php
new file mode 100644
index 0000000..6f3d417
--- /dev/null
+++ b/skeleton/meta/crontab.php
@@ -0,0 +1,26 @@
+<?php
+
+use Psr\Http\Message\ResponseInterface,
+    Psr\Http\Message\ServerRequestInterface;
+
+/*
+    Min  Hour Day  Mon  Weekday
+    *    *    *    *    * 
+    ┬    ┬    ┬    ┬    ┬
+    │    │    │    │    └─  Weekday  (0=Sun .. 6=Sat)
+    │    │    │    └──────  Month    (1..12)
+    │    │    └───────────  Day      (1..31)
+    │    └────────────────  Hour     (0..23)
+    └─────────────────────  Minute   (0..59)
+
+    ex: 
+        0 * * * * 	Chaque heure
+        15 2 * * 0 	Tout les dimanches soir a 2h15 AM
+*/
+
+return [
+    "* * * * *" => function(ServerRequestInterface $request, ResponseInterface $response) : ResponseInterface 
+    {
+    
+    },
+];
diff --git a/skeleton/meta/definitions/auth.php b/skeleton/meta/definitions/auth.php
new file mode 100644
index 0000000..aa5a32e
--- /dev/null
+++ b/skeleton/meta/definitions/auth.php
@@ -0,0 +1,52 @@
+<?php
+
+use function DI\autowire, DI\create, DI\get;
+
+use %NAMESPACE%\Entity;
+
+use Ulmus\Entity\Field\Datetime,
+    Ulmus\User\Lib\Authenticate;
+
+use Storage\{ Session, Cookie };
+
+use Laminas\Diactoros\Response\{ RedirectResponse, HtmlResponse };
+
+use Notes\Security\SecurityHandler;
+
+use Picea\Picea;
+
+use TheBugs\Email\{ EmailConfiguration, MailerInterface, SwiftMailer };
+
+return [
+    Entity\User::class => autowire(Entity\User::class),
+
+    Authenticate::class => create(Authenticate::class)->constructor(get(Session::class), get(Cookie::class), get('authentication.method')),
+
+    SecurityHandler::class => create(SecurityHandler::class)->constructor(function() {
+        return new RedirectResponse(getenv("URL_BASE")."/connexion");
+    }),
+
+    'authentication.error' => function($c, Picea $picea) {
+        return function($message) use ($picea) {
+            return new HtmlResponse($picea->renderHtml('lean/error/500', [
+                'title' => "",
+                'subtitle' => "",
+                'message' => $message,
+            ]));
+        };
+    },
+
+    EmailConfiguration::class => function($c) {
+        $email = new EmailConfiguration( EmailConfiguration::AUTH_TYPE_SMTP );
+        $email->smtpHost = getenv('SMTP_HOST');
+        $email->smtpPort = getenv('SMTP_PORT');
+        $email->smtpUsername = getenv('SMTP_USERNAME');
+        $email->smtpPassword = getenv('SMTP_PASSWORD');
+        $email->smtpUseTLS = getenv('SMTP_TLS');
+        $email->toAddress = getenv("TO_EMAIL");
+        $email->fromAddress = getenv("FROM_EMAIL");
+        $email->fromName = getenv("FROM_NAME");
+
+        return $email;
+    },
+];
diff --git a/skeleton/meta/definitions/definitions.php b/skeleton/meta/definitions/definitions.php
new file mode 100644
index 0000000..601e853
--- /dev/null
+++ b/skeleton/meta/definitions/definitions.php
@@ -0,0 +1,36 @@
+<?php
+
+use function DI\autowire, DI\create, DI\get;
+
+$dir = getenv("META_PATH") . "/definitions";
+
+return array_merge(
+    Lean\Lean::definitions(),
+
+    Lean\Console\Lean::definitions(),
+
+    [
+        '%APPKEY%' => [
+            'picea' => [
+                'context' => "%ESCAPED_NAMESPACE%\\View",
+
+                'extensions' => [
+                ],
+
+            ],
+
+            'ulmus' => [
+                'entities' => [ '%ESCAPED_NAMESPACE%\\Entity' => getenv("PROJECT_PATH") . '/src/Entity/' ],
+            ],
+
+            'routes' => [
+                '%ESCAPED_NAMESPACE%\\Controller' => getenv("PROJECT_PATH") . '/src/Controller/',
+            ],
+        ],
+    ],
+
+    require("$dir/auth.php"),
+    require("$dir/storage.php"),
+    require("$dir/env/" . getenv('APP_ENV') . ".php"),
+    [ 'config' => function () { return require(getenv("META_PATH")."/config.php"); } ]
+);
diff --git a/skeleton/meta/definitions/env/dev.php b/skeleton/meta/definitions/env/dev.php
new file mode 100644
index 0000000..7859e15
--- /dev/null
+++ b/skeleton/meta/definitions/env/dev.php
@@ -0,0 +1,14 @@
+<?php
+
+use function DI\create, DI\autowire, DI\get;
+
+use Dump\DumpMiddleware;
+
+if ($_GET['sql'] ?? false) {
+    \Ulmus\Common\PdoObject::$dump = "dump";
+}
+
+return [
+    "dump" => create(DumpMiddleware::class),
+    "errorHandler" => create(Middlewares\Whoops::class),
+];
diff --git a/skeleton/meta/definitions/env/prod.php b/skeleton/meta/definitions/env/prod.php
new file mode 100644
index 0000000..28da8e9
--- /dev/null
+++ b/skeleton/meta/definitions/env/prod.php
@@ -0,0 +1,42 @@
+<?php
+
+use Picea\Picea;
+
+use CSLSJ\Debogueur\DebogueurMiddleware;
+
+use Laminas\Diactoros\Response\HtmlResponse;
+
+use Psr\Http\Server\MiddlewareInterface,
+    Psr\Http\Message\ServerRequestInterface,
+    Psr\Http\Server\RequestHandlerInterface,
+    Psr\Http\Message\ResponseInterface;
+
+use function DI\{ create, get, autowire };
+
+error_reporting(getenv('ERROR_REPORTING') ?: ( E_ALL & ~E_USER_DEPRECATED & ~E_DEPRECATED & ~E_STRICT & ~E_NOTICE ));
+
+return [
+    /* do nothing in production !*/
+    "dump" => function($c) {
+        if (! function_exists('dump') ) {
+            function dump(...$what) {}
+        }
+
+        return new class implements MiddlewareInterface {
+            public function process(ServerRequestInterface $request, RequestHandlerInterface $handler) : ResponseInterface { return $handler->handle($request); }
+        };
+    },
+
+    "errorHandler" => create(DebogueurMiddleware::class)->constructor(getenv('DEBOGUEUR_HASH') ?: "", null, get('app.errorhandler.html')),
+
+    'app.errorhandler.html' => function($c, Picea $picea) {
+        return function(\Throwable $exception) use ($picea) {
+            return new HtmlResponse($picea->renderHtml('lean/error/500', [
+                'title' => "Une erreur s'est produite lors de l'exécution du script.",
+                'subtitle' => "Êtes-vous connecté avec le bon compte ?",
+                'message' => $exception->getMessage(),
+                'exception' => $exception,
+            ]));
+        };
+    },
+];
diff --git a/skeleton/meta/definitions/storage.php b/skeleton/meta/definitions/storage.php
new file mode 100644
index 0000000..c5011fc
--- /dev/null
+++ b/skeleton/meta/definitions/storage.php
@@ -0,0 +1,25 @@
+<?php
+
+use Psr\Container\ContainerInterface;
+
+use Ulmus\ConnectionAdapter,
+    Ulmus\Container\AdapterProxy;
+
+use LdapRecord\Connection;
+
+return [
+    ConnectionAdapter::class => function($c) {
+        $adapter = new ConnectionAdapter('default', $c->get('config')['ulmus'], true);
+        $adapter->resolveConfiguration();
+
+        $adapter->connect();
+
+        return $adapter;
+    },
+
+    AdapterProxy::class => function (ContainerInterface $c) {
+        return new AdapterProxy(
+            $c->get(ConnectionAdapter::class)
+        );
+    }
+];
diff --git a/skeleton/public/.htaccess b/skeleton/public/.htaccess
new file mode 100644
index 0000000..b3bd338
--- /dev/null
+++ b/skeleton/public/.htaccess
@@ -0,0 +1,8 @@
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Remove trailing slashes from request URL
+    RewriteCond %{REQUEST_FILENAME} !-d
+    RewriteCond %{REQUEST_URI} (.+)/$
+    RewriteRule ^ %1 [R=301,L]
+</IfModule>
diff --git a/skeleton/public/index.php b/skeleton/public/index.php
new file mode 100644
index 0000000..eb8a548
--- /dev/null
+++ b/skeleton/public/index.php
@@ -0,0 +1,3 @@
+<?php
+
+require_once("../src/Kernel.php");
diff --git a/skeleton/public/web.config b/skeleton/public/web.config
new file mode 100644
index 0000000..4217247
--- /dev/null
+++ b/skeleton/public/web.config
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <system.webServer>
+        <rewrite>
+            <rules>
+                <rule name="Remove trailing slash" stopProcessing="true">
+                    <match url="(.*)/$" />
+                    <conditions>
+                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
+                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
+                    </conditions>
+                    <action type="Redirect" redirectType="Permanent" url="{R:1}" />
+                </rule>
+                <rule name="Framework Routing" stopProcessing="true">
+                    <match url="." ignoreCase="false" />
+                    <conditions logicalGrouping="MatchAll">
+                        <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
+                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" />
+                    </conditions>
+                    <action type="Rewrite" url="index.php" />
+                </rule>
+            </rules>
+        </rewrite>
+        <staticContent>
+            <remove fileExtension=".js" />
+            <mimeMap fileExtension=".js" mimeType="application/x-javascript; charset=UTF-8" />
+            <remove fileExtension=".css" />
+            <mimeMap fileExtension=".css" mimeType="text/css; charset=UTF-8" />
+            <remove fileExtension=".woff" />
+            <remove fileExtension=".eot" />
+            <remove fileExtension=".ttf" />
+            <remove fileExtension=".svg" />
+
+            <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
+            <mimeMap fileExtension=".ttf" mimeType="application/font-sfnt" />
+            <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
+            <mimeMap fileExtension=".woff" mimeType="application/font-woff" />
+        </staticContent>
+        <handlers>
+            <remove name="PHP7.3" />
+            <add name="PHP7.3" path="*.php" verb="*" modules="FastCgiModule" scriptProcessor="C:\php\7.4.0\php-cgi.exe" resourceType="File" requireAccess="Script" />
+        </handlers>
+        <httpErrors errorMode="Detailed" />
+    </system.webServer>
+</configuration>
diff --git a/skeleton/src/Controller/Home.php b/skeleton/src/Controller/Home.php
new file mode 100644
index 0000000..9ceb2d3
--- /dev/null
+++ b/skeleton/src/Controller/Home.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace %NAMESPACE%\Controller;
+
+use Psr\Http\Message\{ServerRequestInterface, ResponseInterface };
+
+use %NAMESPACE%\{ Lib, Entity, Form, };
+
+use function %NAMESPACE%\View\{ _, lang, url, route, form };
+
+/**
+ * @Language("%APPKEY%.home")
+ */
+class Home {
+    use Lib\ControllerTrait;
+
+    /**
+     * @Route("/", "name" => "home")
+     */
+    public function index(ServerRequestInterface $request, array $arguments) : ResponseInterface
+    {
+        form(new Form\Form(), $this->pushContext(new Lib\FormContext($request, "form.name")));
+
+        return $this->renderView('home');
+    }
+}
\ No newline at end of file
diff --git a/skeleton/src/Entity/User.php b/skeleton/src/Entity/User.php
new file mode 100644
index 0000000..ead134f
--- /dev/null
+++ b/skeleton/src/Entity/User.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace %NAMESPACE%\Entity;
+
+use Ulmus\Entity\Field\Datetime;
+
+use %NAMESPACE%\Lib;
+
+/**
+ *  # Table('name' => "user")
+ */
+class User extends \Ulmus\User\Entity\User implements \JsonSerializable
+{
+    use Lib\EntityTrait;
+}
diff --git a/skeleton/src/Form/Form.php b/skeleton/src/Form/Form.php
new file mode 100644
index 0000000..4463be2
--- /dev/null
+++ b/skeleton/src/Form/Form.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace %NAMESPACE%\Form;
+
+use %NAMESPACE%\{ Lib, Entity };
+use Picea\Ui\Method\{ FormContextInterface, Message\ErrorMessage };
+
+use Psr\Http\Message\ServerRequestInterface;
+
+use function %NAMESPACE%\View\{ lang };
+
+class Form implements \Picea\Ui\Method\FormInterface {
+
+    public function initialize(FormContextInterface $context) : void
+    {
+
+    }
+
+    public function validate(FormContextInterface $context) : bool
+    {
+        return $context->valid();
+    }
+
+    public function execute(FormContextInterface $context) : void
+    {
+        $context->pushMessage(Message::generateSuccess(
+            lang("form.success")
+        ));
+    }
+}
diff --git a/skeleton/src/Kernel.php b/skeleton/src/Kernel.php
new file mode 100644
index 0000000..3436682
--- /dev/null
+++ b/skeleton/src/Kernel.php
@@ -0,0 +1,36 @@
+<?php declare(strict_types=1);
+
+namespace %NAMESPACE%;
+
+use Ulmus\ConnectionAdapter;
+
+require_once dirname(__DIR__) . '/vendor/autoload.php';
+
+new class(dirname(__DIR__)) extends \Lean\Kernel {
+
+    public array $paths = [
+        'CACHE_PATH' => "CACHE_DIR",
+        'LOGS_PATH' => "LOGS_DIR",
+        'META_PATH' => "META_DIR",
+        'PUBLIC_PATH' => "PUBLIC_DIR",
+        'PRIVATE_PATH' => "PRIVATE_DIR",
+        'VIEW_PATH' => "VIEW_DIR",
+    ];
+
+    protected function initializeEngine() : self
+    {
+        $this->errorLogPath = getenv("LOGS_PATH") . DIRECTORY_SEPARATOR. date("Y-m").".log";
+
+        $this->definitionFilePath = implode(DIRECTORY_SEPARATOR, [ getenv('META_PATH'), 'definitions', 'definitions.php' ]);
+
+        return parent::initializeEngine();
+    }
+
+    protected function serviceContainer() : self
+    {
+        # $this->container->get(ConnectionAdapter::class);
+
+        return parent::serviceContainer();
+    }
+
+};
diff --git a/skeleton/src/Lib/ControllerTrait.php b/skeleton/src/Lib/ControllerTrait.php
new file mode 100644
index 0000000..00e9439
--- /dev/null
+++ b/skeleton/src/Lib/ControllerTrait.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace %NAMESPACE%\Lib;
+
+use Picea\Picea;
+use Storage\Session;
+use Ulmus\User\Entity\User;
+use Ulmus\User\Lib\Authenticate;
+use %NAMESPACE%\Entity;
+
+/**
+ * @Security("locked" => false)
+ * @RouteParam("methods" => [ "GET", "POST" ])
+ */
+trait ControllerTrait {
+    use \Lean\ControllerTrait;
+
+    public ? \Ulmus\User\Entity\User $user;
+
+    protected Authenticate $authenticate;
+
+    public function __construct(Picea $picea, Session $session, Authenticate $authenticate) {
+        $this->initializeController($picea, $session, $authenticate);
+    }
+
+    public function initializeController(Picea $picea, Session $session, Authenticate $authenticate) {
+        $this->picea = $picea;
+        $this->authenticate = $authenticate;
+        $this->session = $session;
+        $this->user = $authenticate->rememberMe( Entity\User::repository() ) ?: new User();
+    }
+
+}
\ No newline at end of file
diff --git a/skeleton/src/Lib/EntityTrait.php b/skeleton/src/Lib/EntityTrait.php
new file mode 100644
index 0000000..0fd1d8d
--- /dev/null
+++ b/skeleton/src/Lib/EntityTrait.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace %NAMESPACE%\Lib;
+
+trait EntityTrait {
+    use \Ulmus\EntityTrait;
+}
\ No newline at end of file
diff --git a/skeleton/src/Lib/FormContext.php b/skeleton/src/Lib/FormContext.php
new file mode 100644
index 0000000..5c71faa
--- /dev/null
+++ b/skeleton/src/Lib/FormContext.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace %NAMESPACE%\Lib;
+
+class FormContext extends \Picea\Ui\Method\FormContext { }
\ No newline at end of file
diff --git a/skeleton/src/Lib/Message.php b/skeleton/src/Lib/Message.php
new file mode 100644
index 0000000..cc16603
--- /dev/null
+++ b/skeleton/src/Lib/Message.php
@@ -0,0 +1,103 @@
+<?php declare(strict_types=1);
+
+namespace %NAMESPACE%\Lib;
+
+use Picea\Ui\Method\FormMessage;
+
+class Message implements FormMessage {
+
+    const MESSAGE_TYPE = [
+        'success' => [
+            'class' => 'success',
+            'header' => 'Succès !',
+            'message' => ''
+        ],
+
+        'error' => [
+            'class' => 'danger',
+            'header' => 'Error !',
+            'message' => ''
+        ],
+
+        'warning' => [
+            'class' => 'warning',
+            'header' => 'Attention !',
+            'message' => ''
+        ],
+    ];
+
+    public string $type;
+
+    public string $message;
+
+    public string $class;
+
+    public ? string $header = null;
+
+    public function __construct(string $message, string $type = "error", ? string $header = null, ? string $class = null)
+    {
+        $this->message = $message;
+
+        $this->type = $type;
+
+        if ( $header !== null ) {
+            $this->header = $header;
+        }
+        else {
+            $this->header = static::MESSAGE_TYPE[$type]['header'];
+        }
+
+        if ( $class !== null ) {
+            $this->class = $class;
+        }
+        else {
+            $this->class = static::MESSAGE_TYPE[$type]['class'];
+        }
+    }
+
+    public function render() : string
+    {
+        return <<<HTML
+            <article class="message is-{$this->class}" role="alert">
+                <div class="message-body">
+                    <strong>{$this->header}</strong> 
+                    <span>{$this->message}</span>
+                </div>
+            </article>
+        HTML;
+    }
+
+    public function renderJson() : array
+    {
+        return [
+            'name' => 'show-notification',
+            'type' => [
+                'error' => 'danger',
+                'success' => 'success',
+                'warning' => 'warning',
+            ][$this->type],
+            'shake' => '.wrapper',
+            'message' => $this->message,
+        ];
+    }
+
+    public function isError() : bool
+    {
+        return $this->type === "error";
+    }
+
+    public static function generateSuccess(string $message, ? string $header = null, ? string $class = null) : self
+    {
+        return new static($message, 'success', $header, $class);
+    }
+
+    public static function generateError(string $message, ? string $header = null, ? string $class = null) : self
+    {
+        return new static($message, 'error', $header, $class);
+    }
+
+    public static function generateWarning(string $message, ? string $header = null, ? string $class = null) : self
+    {
+        return new static($message, 'warning', $header, $class);
+    }
+}
diff --git a/skeleton/src/Middleware/Authentication.php b/skeleton/src/Middleware/Authentication.php
new file mode 100644
index 0000000..328c276
--- /dev/null
+++ b/skeleton/src/Middleware/Authentication.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace %NAMESPACE%\Middleware;
+
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Http\Message\ResponseInterface;
+
+use Storage\Session;
+
+class Authentication implements MiddlewareInterface {
+
+    public Session $session;
+
+    public string $sessionUserVariable = 'user';
+
+    public ResponseInterface $loginRedirect;
+
+    public function __construct(ResponseInterface $loginRedirect, Session $session)
+    {
+        $this->loginRedirect = $loginRedirect;
+        $this->session = $session;
+    }
+
+    /**
+     * Middleware request handling
+     *
+     * @param  ServerRequestInterface  $request
+     * @param  RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler) : ResponseInterface
+    {
+        $user = $this->session->get( $this->sessionUserVariable() );
+
+        if ( ! $user ) {
+            return $this->loginRedirect;
+        }
+
+        return $handler->handle($request);
+    }
+
+    /**
+     * Getter / setter of Session User Variable
+     *
+     * @param string|null sessionUserVariable
+     * @return mixed
+     */
+    public function sessionUserVariable(?string $set = null) : string
+    {
+        return $set !== null ? $this->sessionUserVariable = $set : $this->sessionUserVariable;
+    }
+}
diff --git a/skeleton/view/base/layout/default.phtml b/skeleton/view/base/layout/default.phtml
new file mode 100644
index 0000000..32353ae
--- /dev/null
+++ b/skeleton/view/base/layout/default.phtml
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="fr">
+    {% section "head" %}
+        <head>
+            <meta charset="UTF-8" />
+            <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+            <title>{% section "head.title" %}{{ title() }} — {{ lang('application_name') }}{% endsection %}</title>
+            <link rel="stylesheet" href="{% asset 'static/css/main.e39066da.css' %}">
+            <style>
+                @font-face{
+                    font-family:FontAwesome;
+                    src:url({% asset 'static/fonts/fontawesome-webfont.674f50d2.eot' %});
+                    src:url({% asset 'static/fonts/fontawesome-webfont.674f50d2.eot' %}) format("embedded-opentype"),
+                        url({% asset 'static/fonts/fontawesome-webfont.af7ae505.woff2' %}) format("woff2"),
+                        url({% asset 'static/fonts/fontawesome-webfont.fee66e71.woff' %}) format("woff"),
+                        url({% asset 'static/fonts/fontawesome-webfont.b06871f2.ttf' %}) format("truetype"),
+                        url({% asset 'static/images/fontawesome-webfont.912ec66d.svg' %}) format("svg");
+                    font-weight:400;
+                    font-style:normal;
+                }
+            </style>
+
+            <link rel="apple-touch-icon" sizes="180x180" href="{% asset 'static/favicon/apple-touch-icon.png' %}">
+            <link rel="icon" type="image/png" sizes="32x32" href="{% asset 'static/favicon/favicon-32x32.png' %}">
+            <link rel="icon" type="image/png" sizes="16x16" href="{% asset 'static/favicon/favicon-16x16.png' %}">
+            <link rel="manifest" href="{% asset 'static/favicon/site.webmanifest' %}">
+            <link rel="mask-icon" href="{% asset 'static/favicon/safari-pinned-tab.svg' %}" color="#5bbad5">
+            <meta name="msapplication-TileColor" content="#2d89ef">
+            <meta name="theme-color" content="#ffffff">
+        </head>
+    {% endsection %}
+
+    {% section "body" %}
+        <body>
+            {% section "body.header" %}{% endsection %}
+
+            {% section "header" %}{% endsection %}
+
+            {% section "message" %}
+                {% view "lean/widget/message" %}
+            {% endsection %}
+
+            <main role="main" class="content">{% section "main" %}{% endsection %}</main>
+
+            <footer>{% section "footer" %}{% endsection %}</footer>
+
+            {% section "body.footer" %}{% endsection %}
+        </body>
+    {% endsection %}
+</html>
\ No newline at end of file
diff --git a/skeleton/view/home.phtml b/skeleton/view/home.phtml
new file mode 100644
index 0000000..1d7e5c9
--- /dev/null
+++ b/skeleton/view/home.phtml
@@ -0,0 +1,9 @@
+{% extends 'base/layout/default' %}
+
+{% title "Home" %}
+
+{% section "main" %}
+    <div class="main">
+        Hello World :) !
+    </div>
+{% endsection %}
\ No newline at end of file
diff --git a/src/Composer.php b/src/Composer.php
new file mode 100644
index 0000000..a4a0e22
--- /dev/null
+++ b/src/Composer.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Lean;
+
+use Composer\EventDispatcher\Event;
+
+class Composer
+{
+    public static function postInstall(Event $event) : void
+    {
+        $event->getIO()->write("post-install script executing ...");
+
+        if ( $event->getIO()->askConfirmation("Do you want to install Lean's Project Skeleton ? ( 'yes' or 'no' (default) ): ", false) ) {
+            $ns = trim(static::getNamespaceFromAutoload($event), '\\');
+
+            $replace = [
+                '%NAMESPACE%' => $ns,
+                '%ESCAPED_NAMESPACE%' => addslashes($ns),
+                '%APPKEY%' => strtolower(str_replace('\\', '.', $ns)),
+                '%RAND64%' => substr(base64_encode(random_bytes(100)), 0, 64),
+            ];
+
+            $dir = static::createPath();
+
+            if ( is_writable($dir) ) {
+                $source = static::createPath('vendor', 'mcnd', 'lean', 'skeleton');
+                $dest = static::createPath('skeleton');
+
+                `cp -a $source $dest`;
+
+                $iterator = new \RecursiveDirectoryIterator($dest);
+                $iterator->setFlags(\RecursiveDirectoryIterator::SKIP_DOTS);
+
+                foreach (new \RecursiveIteratorIterator($iterator) as $file) {
+                    if ( in_array($file->getExtension(), [ 'php', 'phtml', 'env' ]) ) {
+                        $content = str_replace(array_keys($replace), array_values($replace), file_get_contents($file->getPathname()));
+
+                        file_put_contents($file->getPathname(), $content);
+                    }
+                }
+
+                foreach(scandir(static::createPath('skeleton')) as $item) {
+                    if ( in_array($item, [ '.', '..' ]) ) continue;
+
+                    rename(static::createPath('skeleton', $item), static::createPath($item));
+                }
+
+                rmdir($dest);
+
+                $event->getIO()->write("Installation completed.");
+            }
+            else {
+                $event->getIO()->writeError(sprintf("The user you are running this script with doesn't seem to have a writable permission on directory %s", static::createPath()));
+            }
+        }
+    }
+
+    protected static function readComposerJson(Event $event) : ? array
+    {
+        $path = static::createPath('composer.json');
+
+        return file_exists($path) ? json_decode(file_get_contents($path), true) : null;
+    }
+
+    protected static function getNamespaceFromAutoload(Event $event) : ? string
+    {
+        if ( null !== $composerJson = static::readComposerJson($event) ) {
+            if ( $psr4 = $composerJson['autoload']['psr-4'] ?? false ) {
+                foreach($psr4 as $ns => $directory) {
+                    if ($directory === 'src/') {
+                        return $ns;
+                    }
+                }
+            }
+            else {
+                $event->getIO()->writeError("Your composer file do not seem to contains a valid psr-4 project of it's autoload array.");
+            }
+        }
+        else {
+            $event->getIO()->writeError("Composer.json file not found. Have this script been launch from the Composer CLI at the root of your project ?");
+        }
+
+        $event->getIO()->writeError("Your composer file do not seem to contains a valid psr-4 project pointing to the src folder.");
+
+        return null;
+    }
+
+    protected static function createPath(... $path) : string
+    {
+        return implode(DIRECTORY_SEPARATOR, array_merge([ $_SERVER['PWD'] ], $path));
+    }
+}
\ No newline at end of file
diff --git a/src/ControllerTrait.php b/src/ControllerTrait.php
index d600b77..5be7d54 100644
--- a/src/ControllerTrait.php
+++ b/src/ControllerTrait.php
@@ -2,8 +2,8 @@
 
 namespace Lean;
 
-use CSLSJ\Common\RequestResponse\DownloadResponse;
-use CSLSJ\Common\RequestResponse\ImageResponse;
+use CSLSJ\Common\RequestResponse\{ PdfResponse, ImageResponse, DownloadResponse };
+
 use Picea,
     Picea\Ui\Method\FormContext;
 
@@ -63,6 +63,11 @@ trait ControllerTrait {
         return new RedirectResponse($url, $code, $headers);
     }
 
+    public function renderPdf($rawdata, int $status = 200, array $headers = []) : PdfResponse
+    {
+        return new PdfResponse($rawdata, $status, $headers);
+    }
+
     public static function renderText(string $html, int $code = 200, array $headers = []) : ResponseInterface
     {
         return new TextResponse($html, $code, $headers);
diff --git a/src/Lean.php b/src/Lean.php
index 7c8f64b..84d1560 100644
--- a/src/Lean.php
+++ b/src/Lean.php
@@ -107,6 +107,7 @@ class Lean
         $path = dirname(__DIR__) . "/meta/definitions/";
 
         return array_merge(
+            require($path . "email.php"),
             require($path . "http.php"),
             require($path . "language.php"),
             require($path . "routes.php"),
diff --git a/view/lean/error/500.phtml b/view/lean/error/500.phtml
new file mode 100644
index 0000000..2e531e4
--- /dev/null
+++ b/view/lean/error/500.phtml
@@ -0,0 +1,24 @@
+{% extends "lean/layout/error" %}
+
+{% language.set "lean.error.500" %}
+
+{% title _('page-title') %}
+
+{% section "content-right" %}
+    <div>
+        <div class="title">{% _ "title" %}</div>
+        <div class="subtitle">{{= isset($subtitle) ? nl2br($subtitle) :  _("subtitle") }}</div>
+        <div class="content">{{= isset($message) ? nl2br($message) :  _("message") }}</div>
+        <u><a href="#" onclick="history.back()">{% _ "back" %}</a></u>
+    </div>
+{% endsection %}
+
+{% section "content-left" %}
+    <img class="picto-login" src="{% asset 'static/img/bugs.svg' %}">
+{% endsection %}
+
+{% section "head.css" %}
+    .title {font-size:2rem}
+    .subtitle {font-size:1.25rem; padding-top: 1rem;}
+    .content {padding-top:1rem}
+{% endsection %}