basic cookbook for Interfaces

Design and implement a cookbook subsite for app.t-pen.org (this repository) that will run in the Jekyll _cookbook directory. The goal is to describe for developers how they can build their own interfaces using the components available and by using the api classes to construct their own. The "recipes" should consider small stories that represent parts of real-world use cases that highlight specific skills and mechanics of the Interfaces achitecture or featuers that TPEN allows, such as modifying profiles, logging in remotely, using permissions, etc.