Merge pull request #14 from Microsoft/addBuildBadge

Add master branch build status badge to readme

Author: zhengbli

README.md

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 # TypeScript and JavaScript lib generator
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+[![Build status](https://ci.appveyor.com/api/projects/status/8oj3j7u6nvag1xvu/branch/master?svg=true)](https://ci.appveyor.com/project/zhengbli/tsjs-lib-generator/branch/master)
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 This tool is used to generate `dom.generated.d.ts` and `webworker.generated.d.ts` for TypeScript, and `domWeb.js` and `domWindows.js` for Visual Studio JavaScript language service. The input file is the XML spec file generated by the Microsoft Edge browser.
 
 ## Build Instruction