(CarbonDelta 3/3) Add CarbonDelta repo

Rebased to account for CarbonAbout being merged first. Dammit guys :-/

(cherry picked from commit 420e1844fc991ed14b401ac88c2f06cea676ba1e)
Change-Id: I238d3cfe4469d079317e084eb15f73c5a4a34aa3