run the app from public index file

bootstrap/app.php

@@ -0,0 +1,18 @@
+<?php
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use DI\Bridge\Slim\Bridge;
+
+$container = require __DIR__.'/container.php';
+$app = Bridge::create($container);
+
+// change first param to false for production
+$app->addErrorMiddleware(true, true, true);
+
+$app->get('/', function (Response $response) {
+    $response->getBody()->write("Hello world!");
+    return $response;
+});
+
+return $app;