Add more Sonarcloud badges

Author: rkosegi

README.md

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 # Hetzner Cloud API Client
 
 [![Sonarcloud](https://sonarcloud.io/api/project_badges/measure?project=dNationCloud_hetzner-cloud-client-java&metric=alert_status)](https://sonarcloud.io/project/overview?id=dNationCloud_hetzner-cloud-client-java)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=dNationCloud_hetzner-cloud-client-java&metric=coverage)](https://sonarcloud.io/summary/new_code?id=dNationCloud_hetzner-cloud-client-java)
+[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=dNationCloud_hetzner-cloud-client-java&metric=reliability_rating)](https://sonarcloud.io/summary/new_code?id=dNationCloud_hetzner-cloud-client-java)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=dNationCloud_hetzner-cloud-client-java&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=dNationCloud_hetzner-cloud-client-java)
+
+
 
 This is client library for [Hetzner cloud](https://www.hetzner.com/cloud), based on [Retrofit HTTP client](https://github.com/square/retrofit).