[Coco] CocoRPi3 initial documentation

[Ron Klein]

Hello everyone,

I have posted the first draft of the CocoRPi3 documentation in Google
Docs.  It's not complete and not formatted with a Table of Contents or
Index (which I plan to do) but want to get something out there for folks to
review.  I hope to have the CocoPi3 image posted before end of day tomorrow
(4/15/2017 12:00am CST) and will provide those links.

Please let me know if there are any issues accessing this:

https://docs.google.com/document/d/1r0mBX0R8EDzp44hSRidD6dD1tJc-YRiyAU4i2h_uvz8/edit?usp=sharing

Thanks!

-Ron