We are stating that these structures will be stable, so include them
in the documentation directly.
Bug: 152466437
Test: n/a
Change-Id: I52a05f61163aa35b99869d722284ff3f98d7f010
This protocol documentation is spread out among various functions
where it is implemented. This change makes a single
README.protocol.md file with a high level overview, referencing the
struct names where useful.
Test: n/a
Change-Id: I83c9f484352b489b4a20cce241d92413f780f9ec