Improve README

[chris-gong]

This is another reminder for me that I have to modify the readme so that it is more up to date and has all the information needed to prepare, build, and run the project. Also, I plan on including architecture graphics to give a better higher level overview of what's going on. This is a huge priority once part 8 of the tutorials is released, because that should be the last video in which we write major code.

If anyone else has any suggestions for what should be added to the readme, then please comment on this issue!