sonar badge

Author: hauner

README.md

@@ -1,4 +1,5 @@
 [![][badge-ci]][workflow-ci]
+[![Coverage][sonar-coverage]]()
 
 
 ![openapi-processor-spring logo](images/openapi-processor-spring@1280x200.png)
@@ -17,6 +18,8 @@ See [here][oap-docs].
 [badge-ci]: https://github.com/openapi-processor/openapi-processor-spring/workflows/ci/badge.svg
 [oap-license]: https://github.com/openapi-processor/openapi-processor-spring/blob/master/LICENSE
 [workflow-ci]: https://github.com/openapi-processor/openapi-processor-spring/actions?query=workflow%3Aci
+[sonar-coverage]: https://sonarcloud.io/api/project_badges/measure?project=openapi-processor_openapi-processor-spring&metric=coverage
+[sonar]: https://sonarcloud.io/dashboard?id=openapi-processor_openapi-processor-spring
 [oap-docs]: https://docs.openapiprocessor.io/spring
 [openapi]: https://www.openapis.org/
 [springboot]: https://spring.io/projects/spring-boot