Add build status badge in readme

Author: zhengbli

README.md

@@ -1,4 +1,5 @@
 # TypeScript-TmLanguage
+[![Build status](https://ci.appveyor.com/api/projects/status/i7fp97q9nc5uw5kf?svg=true)](https://ci.appveyor.com/project/zhengbli/typescript-tmlanguage)
 
 This repository contains TmLanguage files that are consumed by TypeScript editors and plugins such as [Visual Studio Code](https://github.com/Microsoft/vscode), [The TypeScript Sublime Plugin](https://github.com/Microsoft/TypeScript-Sublime-Plugin), [Atom TypeScript](https://github.com/TypeStrong/atom-typescript), and possibly others.
 
@@ -14,4 +15,4 @@ Test are run from within the ```tests``` folder
 cd tests
 npm install         # Installs dependencies required for testing
 npm test            # Compiles & runs tests
-```
+```