Add new GitHub action badge to Readme [no ci]

Author: florian-wagner

README.md

@@ -6,7 +6,7 @@ Readme for Github repository only. (Gets selected before *.rst file)
   <img src="https://www.pygimli.org/_images/pg_logo.png" width="50%">
 </a>
 
-[![Build Status](http://jenkins.pygimli.org/job/pyGIMLi_dev/badge/icon?style=flat-square)](http://jenkins.pygimli.org/job/pyGIMLi_dev/)
+[![pyGIMLi CI](https://github.com/gimli-org/gimli/actions/workflows/main.yml/badge.svg)](https://github.com/gimli-org/gimli/actions/workflows/main.yml)
 [![Anaconda-Server Badge](https://anaconda.org/gimli/pygimli/badges/license.svg)](https://pygimli.org/license.html)
 [![release](https://img.shields.io/github/release/gimli-org/gimli.svg?style=flat-square)](https://github.com/gimli-org/gimli/releases/latest)
 [![Github commits (since latest release)](https://img.shields.io/github/commits-since/gimli-org/gimli/latest.svg?style=flat-square)](https://github.com/gimli-org/gimli/tree/dev)