Added link to Jake website

I was unaware of that Jake was so I thought it'd be handy to include a link to the website.

Author: AverageMarcus

README.md

@@ -61,7 +61,7 @@ Change to the TypeScript directory:
 cd TypeScript
 ```
 
-Install Jake tools and dev dependencies:
+Install [Jake](http://jakejs.com/) tools and dev dependencies:
 
 ```bash
 npm install -g jake