Added admin layout

app/Middleware/AdminRoleMiddleware.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Middleware;
+
+use App\Enumerations\UserRole;
+use App\Providers\AuthCheckProvider;
+use Closure;
+
+class AdminRoleMiddleware
+{
+    public function handle($request, Closure $next)
+    {
+        if (!auth()->check()) {
+            return redirect('/login')->with('message', 'Du musst eingeloggt sein.');
+        }
+
+        $authCheck = new AuthCheckProvider();
+        $role = $authCheck->getUserRole();
+
+        if (!in_array($role, [UserRole::USER_ROLE_ADMIN, UserRole::USER_ROLE_GROUP_LEADER], true)) {
+            return redirect('/')->with('message', 'Du bist dazu nicht berechtigt.');
+        }
+
+        return $next($request);
+    }
+}