Add build badge (#26)

README.md

@@ -1,4 +1,4 @@
-# VSCode AppCenter Tools
+# VSCode AppCenter Tools · [![Build Status](https://msmobilecenter.visualstudio.com/_apis/public/build/definitions/d7809725-8fd7-4b76-8022-ebb8720603f6/2854/badge)](https://msmobilecenter.visualstudio.com/Patricks%20Sandbox/_build/index?definitionId=2854)
 This extension provides a development support for AppCenter projects. 
 
 _NOTE: Currently it supports only React-Native based apps._
@@ -52,4 +52,4 @@ Before we can accept your pull request you will need to sign a **Contribution Li
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
 
 ## License
-[MIT](LICENSE.md)
+[MIT](LICENSE.md)