add .env.docker file to be edited by the user to get a pre configured app

laravel/.env.docker

+APP_ENV=local
+APP_DEBUG=true
+APP_KEY=wqgyoHNBQBgPjLorn3pJNGwYlehhXfD3
+
+CACHE_DRIVER=redis
+SESSION_DRIVER=redis
+QUEUE_DRIVER=beanstalkd
+
+DB_HOST=laravel.dev
+DB_DATABASE=laravel-database
+DB_USERNAME=root
+DB_PASSWORD=pass
+
+REDIS_HOST=laravel.dev
+REDIS_PORT=6379
+
+BEANSTALKED_HOST=laravel.dev
+BEANSTALKED_PORT=11300
+
+MAIL_DRIVER=smtp
+MAIL_HOST=mailtrap.io
+MAIL_PORT=2525
+MAIL_USERNAME=null
+MAIL_PASSWORD=null
+MAIL_ENCRYPTION=null