Add Appveyor badge

README.md

@@ -1,5 +1,7 @@
-SonarQube Scanner [![Build Status](https://travis-ci.org/SonarSource/sonar-scanner-cli.svg?branch=master)](https://travis-ci.org/SonarSource/sonar-scanner-cli)
+SonarQube Scanner 
 =========================
+[![Build Status](https://travis-ci.org/SonarSource/sonar-scanner-cli.svg?branch=master)](https://travis-ci.org/SonarSource/sonar-scanner-cli)
+[![Build status](https://ci.appveyor.com/api/projects/status/s3sg3fhui556v02o/branch/master?svg=true)](https://ci.appveyor.com/project/henryju/sonar-scanner-cli/branch/master)
 
 Official SonarQube Scanner used to start code analysis. Project configuration is read from a sonar-project.properties or passed on command line.