Update documentation to reflect the addition of the BootlegTokenApp

[brian-lc]

Overview

As a user of the bootleg token, so I can try out the buying/selling process update the documentation so that it is clear how to use the BootegTokenApp contract and it's features.

Acceptance

• Bootleg website/SDK content updated with new content about the App, how to use it, where the code is on github
• Updated readme's in bootleg repo with mention of the App contract and how to use it
• Video walkthrough of bootleg trading on testnet.