adding notes to readme, pulling in old tilemap javascript code
More notes, ideas, components, and assets

- added open art hex tiles
- components for entity to split out and encapsulate work
- improved organization
- prep work for 3 example games (RTS, TD, FFT)
* will likely want to separate into multiple repos/tutorials
  since now this is becoming collection of all game dev stuff
  with an emphasis on learning Unity
add resources, notes, earlier tests to compile into single project