Update README.md

Author: khoih-prog

README.md

@@ -1,6 +1,10 @@
 # ESP_AT_WiFiManager
 
 [![arduino-library-badge](https://www.ardu-badge.com/badge/ESP_AT_WiFiManager.svg?)](https://www.ardu-badge.com/ESP_AT_WiFiManager)
+[![GitHub release](https://img.shields.io/github/release/khoih-prog/ESP_AT_WiFiManager.svg)](https://github.com/khoih-prog/ESP_AT_WiFiManager/releases)
+[![GitHub](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/khoih-prog/ESP_AT_WiFiManager/blob/master/LICENSE)
+[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
+[![GitHub issues](https://img.shields.io/github/issues/khoih-prog/ESP_AT_WiFiManager.svg)](http://github.com/khoih-prog/ESP_AT_WiFiManager/issues)
 
 This library is based on, modified, bug-fixed and improved from: