Documents the per-project layout under src/ (Abstract, Server,
Org, Api, Blogs, Web, Org.Tests) as one of the two remaining
items of Jalon 0 in ROADMAP.md:
'Decoupage Yavsc.Org vs Yavsc.Server vs Yavsc.Api clarifie
dans l'Architecture'
The page is referenced from the new doc/README.md index, and
will also be linked from CONTRIBUTING.md in the next commit.
