setup basic app controller

src/Controller/AppController.php

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+<?php
+
+namespace App\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+
+class AppController extends AbstractController
+{
+    #[Route('/homepage', name: 'homepage')]
+    public function index(): Response
+    {
+        return $this->render('app/index.html.twig', [
+            'controller_name' => 'AppController',
+        ]);
+    }
+}

templates/app/index.html.twig

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+{% extends 'base.html.twig' %}
+
+{% block title %}Hello AppController!{% endblock %}
+
+{% block body %}
+<style>
+    .example-wrapper { margin: 1em auto; max-width: 800px; width: 95%; font: 18px/1.5 sans-serif; }
+    .example-wrapper code { background: #F5F5F5; padding: 2px 6px; }
+</style>
+
+<div class="example-wrapper">
+    <h1>Hello {{ controller_name }}! ✅</h1>
+
+    This friendly message is coming from:
+    <ul>
+        <li>Your controller at <code><a href="{{ '/home/thisfro/repos/plant-exchange/src/Controller/AppController.php'|file_link(0) }}">src/Controller/AppController.php</a></code></li>
+        <li>Your template at <code><a href="{{ '/home/thisfro/repos/plant-exchange/templates/app/index.html.twig'|file_link(0) }}">templates/app/index.html.twig</a></code></li>
+    </ul>
+</div>
+{% endblock %}