Add SonarQube code quality badge

Author: racodond

README.md

@@ -4,6 +4,7 @@ Puppet-SonarQube
 [![Build Status](https://travis-ci.org/maestrodev/puppet-sonarqube.svg?branch=master)](https://travis-ci.org/maestrodev/puppet-sonarqube)
 [![Puppet Forge](https://img.shields.io/puppetforge/v/maestrodev/sonarqube.svg)](https://forge.puppetlabs.com/maestrodev/sonarqube)
 [![Puppet Forge](https://img.shields.io/puppetforge/f/maestrodev/sonarqube.svg)](https://forge.puppetlabs.com/maestrodev/sonarqube)
+[![Quality Gate](https://nemo.sonarqube.org/api/badges/gate?key=puppet-sonarqube)](https://nemo.sonarqube.org/dashboard/index/puppet-sonarqube)
 
 
 A puppet recipe to install SonarQube (former Sonar)