Update README.md

Author: hoc081098

README.md

@@ -3,6 +3,8 @@
 -   Flutter github search using [rx_redux](https://pub.dev/packages/rx_redux) <br>
 -   Functional & reactive programming with [rxdart](https://pub.dev/packages/rxdart), [rx_redux](https://pub.dev/packages/rx_redux) 🚀
 
+[![Flutter](https://github.com/hoc081098/flutter_github_search_rx_redux/actions/workflows/flutter.yml/badge.svg)](https://github.com/hoc081098/flutter_github_search_rx_redux/actions/workflows/flutter.yml)
+
 <p align="center">
     <img src="https://github.com/hoc081098/rx_redux/blob/v2/images/logo.png?raw=true" alt="Logo" width="300"/>
 </p>