add SonarCloud Badge (and others) to Readme

README.md

 # OSHDB Examples
 
+[![Build Status](http://jenkins.ohsome.org/buildStatus/icon?job=oshdb-examples/oshdb-snapshot)](http://jenkins.ohsome.org/blue/organizations/jenkins/oshdb-examples/activity)
+[![Sonarcloud Status](https://sonarcloud.io/api/project_badges/measure?project=org.heigit.ohsome:oshdb-examples&metric=alert_status)](https://sonarcloud.io/dashboard?id=org.heigit.ohsome:oshdb-examples)
+[![LICENSE](https://img.shields.io/badge/license-Apache--2.0-orange)](LICENSE)
+[![status: active](https://github.com/GIScience/badges/raw/master/status/active.svg)](https://github.com/GIScience/badges#active)
+
 These are some examples for the use of the OSHDB. This repository focuses on the [OSHDB-API](https://github.com/GIScience/oshdb/blob/master/documentation/first-steps/README.md).
 
 You can check out this repository and run the example classes – to see immediate results or use it as building blocks for coding your own OSHDB queries.

[jenkins]

✖ jenkinsci/branch: The Jenkins CI build failed - Details