Add showcase code

dev/public/index.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+use Pcm\BadgeBundle\Dev\Kernel;
+use Symfony\Component\HttpFoundation\Request;
+
+require_once dirname(__DIR__, 2).'/vendor/autoload.php';
+
+$_SERVER['APP_ENV']   = $_SERVER['APP_ENV']   ?? 'dev';
+$_SERVER['APP_DEBUG'] = $_SERVER['APP_DEBUG'] ?? '1';
+
+$kernel   = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$request  = Request::createFromGlobals();
+$response = $kernel->handle($request);
+$response->send();
+$kernel->terminate($request, $response);