Add missing files

.env

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+# This file is a "template" of which env vars need to be defined for your application
+# Copy this file to .env file for development, create environment variables when deploying to production
+# https://symfony.com/doc/current/best_practices/configuration.html#infrastructure-related-configuration
+
+###> symfony/framework-bundle ###
+APP_ENV=dev
+APP_SECRET=94e0ae4ca2770425e020e9703e38b48c
+#TRUSTED_PROXIES=127.0.0.1,127.0.0.2
+#TRUSTED_HOSTS=localhost,example.com
+###< symfony/framework-bundle ###
+
+APP_GENERATION_LIMIT=100

config/bootstrap.php

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+<?php
+
+use Symfony\Component\Dotenv\Dotenv;
+
+require dirname(__DIR__).'/vendor/autoload.php';
+
+// Load cached env vars if the .env.local.php file exists
+// Run "composer dump-env prod" to create it (requires symfony/flex >=1.2)
+if (is_array($env = @include dirname(__DIR__).'/.env.local.php')) {
+    $_SERVER += $env;
+    $_ENV += $env;
+} elseif (!class_exists(Dotenv::class)) {
+    throw new RuntimeException('Please run "composer require symfony/dotenv" to load the ".env" files configuring the application.');
+} else {
+    // load all the .env files
+    (new Dotenv())->loadEnv(dirname(__DIR__).'/.env');
+}
+
+$_SERVER['APP_ENV'] = $_ENV['APP_ENV'] = ($_SERVER['APP_ENV'] ?? $_ENV['APP_ENV'] ?? null) ?: 'dev';
+$_SERVER['APP_DEBUG'] = $_SERVER['APP_DEBUG'] ?? $_ENV['APP_DEBUG'] ?? 'prod' !== $_SERVER['APP_ENV'];
+$_SERVER['APP_DEBUG'] = $_ENV['APP_DEBUG'] = (int) $_SERVER['APP_DEBUG'] || filter_var($_SERVER['APP_DEBUG'], FILTER_VALIDATE_BOOLEAN) ? '1' : '0';