Adding npm related badges to the readme

Author: danquirk

README.md

@@ -1,6 +1,8 @@
 [![Build Status](https://travis-ci.org/Microsoft/TypeScript.svg?branch=master)](https://travis-ci.org/Microsoft/TypeScript)
 [![Issue Stats](http://issuestats.com/github/Microsoft/TypeScript/badge/pr)](http://issuestats.com/github/microsoft/typescript)
 [![Issue Stats](http://issuestats.com/github/Microsoft/TypeScript/badge/issue)](http://issuestats.com/github/microsoft/typescript)
+[![npm version](https://badge.fury.io/js/typescript.svg)](http://badge.fury.io/js/typescript)
+[![Downloads](http://img.shields.io/npm/dm/TypeScript.svg)](https://npmjs.org/package/typescript)
 
 # TypeScript