Update README.md

Author: dungngminh

README.md

@@ -6,6 +6,8 @@
 
 Very Good Blog App Backend built with dart_frog
 
+**This repository is now part of [very_good_flutter_blog_app](https://github.com/dungngminh/very_good_flutter_blog_app) backend folder**
+
 [license_badge]: https://img.shields.io/badge/license-MIT-blue.svg
 [license_link]: https://opensource.org/licenses/MIT
 [very_good_analysis_badge]: https://img.shields.io/badge/style-very_good_analysis-B22C89.svg