Update README.md

Author: JohannesHoppe

README.md

@@ -2,6 +2,7 @@
 
 [![NPM version][npm-image]][npm-url]
 [![CircleCI](https://circleci.com/gh/angular-schule/angular-cli-ghpages.svg?style=svg)](https://circleci.com/gh/angular-schule/angular-cli-ghpages)
+[![GitHub Actions](https://github.com/angular-schule/angular-cli-ghpages/actions/workflows/main.yml/badge.svg)](https://github.com/angular-schule/angular-cli-ghpages/actions/workflows/main.yml)
 [![The MIT License](https://img.shields.io/badge/license-MIT-orange.svg?color=blue&style=flat-square)](http://opensource.org/licenses/MIT)
 
 **Deploy your Angular app to GitHub pages directly from the Angular CLI! 🚀**