Tutorial for PoE Front End

[JoshOrndorff]

The PoE Tutorial gives a detailed explanation about writing the PoE pallet itself. Then it simply gives the learner working code for the front end. This is an appropriate ending to that tutorial because it exposes the learner to the existence of the front-end template, and lets them play with their new pallet immediately.

However, we should also provide a tutorial explaining how to really use the front-end-template and empowering users to build their own custom front ends.