move the "Masonry for the compliance literate" documentation in

[afeld]

Broken out from cloud-gov/product#253.

https://docs.google.com/document/d/1mNV7yzrorBF4YD9uIOr75KOPCrta8eMkk0Gf8edhyZs/edit

[afeld]

Not exactly sure of the best place for this to live...the README is getting long enough that we might want to start splitting it out to different Markdown files under a docs/ folder or something (or maybe move documentation to the website)...that is a whole other can of worms though, and thus should probably be its own issue ("content strategy for Masonry/OpenControl").

/cc @brittag

[brittag]

I'd do something simple for now - make a docs/ folder, put a .md file in it, link to that from the README. Then when we have a chance to talk about overall content strategy for Masonry/OpenControl, we can figure out where best to put it!