[TASK] Add sonar badges

Author: brotkrueml

README.md

@@ -1,6 +1,8 @@
 # JobRouter Client
 
 [![Build Status](https://travis-ci.org/brotkrueml/jobrouter-client.svg?branch=master)](https://travis-ci.org/brotkrueml/jobrouter-client)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=jobrouter-client&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=jobrouter-client)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=jobrouter-client&metric=coverage)](https://sonarcloud.io/dashboard?id=jobrouter-client)
 
 ## Introduction