Update README.md

Signed-off-by: Pascal Cremer <[email protected]>

Author: b00gizm

README.md

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 # DDD - Domain Driven Design with PHP
 
+[![Unit tests workflow status](https://github.com/geekcell/php-ddd/actions/workflows/tests.yml/badge.svg)](https://github.com/geekcell/php-ddd/actions/workflows/tests.yml) [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=geekcell_php-ddd&metric=coverage)](https://sonarcloud.io/summary/new_code?id=geekcell_php-ddd) [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=geekcell_php-ddd&metric=bugs)](https://sonarcloud.io/summary/new_code?id=geekcell_php-ddd) [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=geekcell_php-ddd&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=geekcell_php-ddd)
+
 Your ultimate guard rails for domain driven design with PHP.
 
 ## Installation