Add doc for class and methods for TID API

[klahnakoski]

I would like to see a small doc that points to the main class responsible for TID management, and the (public) methods that can be called on it. This will help me make more test cases, and provide you with paice of code that turn your class into a web api.

[natj212]

I'll write a readme that describes the methods and outlines the class once I get some more work done one it. Right now I just have the grabTID method.