Documentation for proper timeline creation

Threadmill example is good showcase for all things that are relevant for the proper app UI creation. There are animations and states defined properly to be able to create nice transitions.

These transitions should be documented so they can be done by viewer of the example project on their own.

1. How to create proper timeline setup
2. What are the steps how timeline animation is done and edited
3. How to make sure timeline animation works also on the embedded target