add a admin dashboard controller

src/Controller/DashboardAdminController.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Controller;
+
+use App\Core\Controller\Dashboard\DashboardAdminController as Controller;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * @Route("/admin")
+ */
+class DashboardAdminController extends Controller
+{
+    /**
+     * @Route("/", name="admin_dashboard_index")
+     */
+    public function index(): Response
+    {
+        return $this->render('admin/dashboard.html.twig');
+    }
+}

templates/admin/dashboard.html.twig

@@ -0,0 +1,5 @@
+{% extends '@Core/admin/layout.html.twig' %}
+
+{% block body %}
+    <iframe src="https://doc.murph-project.org" frameborder="0" marginheight="0" marginwidth="0" width="100%" style="height: calc(100vh - 65px)"></iframe>
+ {% endblock %}