README: Added sonarqube reference

README.md

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 This is a rewrite of the Infoscreen. It aims to make it less bad.
 
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+## Quality
+To ensure code quality, this repo is automatically evaluated by a SonarQube instance.
+
+[![Quality gate](https://sonarqube.upi.li/api/project_badges/quality_gate?project=Fachschaft-Informatik-Infoscreen&token=sqb_1e0e28d3a4ad3e243d0ee76c6dc33d6694d261a2)](https://sonarqube.upi.li/dashboard?id=Fachschaft-Informatik-Infoscreen)
+
 ## Test
 
 This Website can be run locally for testing purposes with `python3 -m http.server` or any other HTTP Server