Agregando el backend de lumen

backend/.env.example

@@ -0,0 +1,19 @@
+APP_NAME='Restaurant API'
+APP_ENV=local
+APP_KEY=
+APP_DEBUG=true
+APP_URL=http://localhost
+APP_TIMEZONE=America/Santiago
+
+LOG_CHANNEL=stack
+LOG_SLACK_WEBHOOK_URL=
+
+DB_CONNECTION=postgresql
+DB_HOST=127.0.0.1
+DB_PORT=5432
+DB_DATABASE=restaurant
+DB_USERNAME=user
+DB_PASSWORD=password
+
+CACHE_DRIVER=file
+QUEUE_CONNECTION=sync