Initial Slim setup with Twig views

app/routes.php

@@ -0,0 +1,10 @@
+<?php
+
+use Slim\Psr7\Request;
+use Slim\Psr7\Response;
+use Slim\Views\Twig;
+
+$app->get('/', function (Request $request, Response $response, array $args) {
+  $view = Twig::fromRequest($request);
+  return $view->render($response, 'index.twig');
+});