Update README.md

Author: ThadHouse

README.md

@@ -1,5 +1,7 @@
 # Gradle C++ VS Code
 
+[![Build status](https://ci.appveyor.com/api/projects/status/70287abkmu24tgou/branch/master?svg=true)](https://ci.appveyor.com/project/ThadHouse/gradle-cpp-vscode/branch/master)
+
 This is a Gradle plugin and VS Code extension to enable C++ intellisense for old style C++ gradle projects. New style projects are currently not supported, but could be added in the future.
 
 ## VS Code Insructions