add app and container files

bootstrap/app.php

@@ -0,0 +1,12 @@
+<?php
+
+use Slim\Factory\AppFactory;
+use Slim\Views\Twig;
+
+$container = require './container.php';
+
+$app = AppFactory::createFromContainer($container);
+
+$twig = Twig::create(__DIR__ . '/../templates', ['cache' => false]);
+
+return $app;

bootstrap/container.php

@@ -0,0 +1,7 @@
+<?php
+
+use DI\Container;
+
+$container = new Container([]);
+
+return $container;