Add github actions badge

Author: Holger Lösken

README.md

@@ -2,6 +2,7 @@
 
 [![Latest Stable Version](https://poser.pugx.org/codedge/laravel-fpdf/v/stable?format=flat-square)](https://packagist.org/packages/codedge/laravel-fpdf)
 [![Total Downloads](https://poser.pugx.org/codedge/laravel-fpdf/downloads?format=flat-square)](https://packagist.org/packages/codedge/laravel-fpdf)
+[![](https://github.com/codedge/laravel-fpdf/workflows/Tests/badge.svg)](https://github.com/codedge/laravel-fpdf/actions)
 [![StyleCI](https://styleci.io/repos/59506451/shield)](https://styleci.io/repos/59506451)
 [![License](https://poser.pugx.org/codedge/laravel-fpdf/license?format=flat-square)](https://packagist.org/packages/codedge/laravel-fpdf)