Communication/README.md

Content has to be integrated here

For now all is in the document layout.md the index of the doc has been worked up on pad https://pad.dyne.org/code/#/1/edit/1vtinoUpsmYruHjDHiW+Ng/CrTbI64coYYuDY72TIheqOkW/

Structures of folders has to be kept aligned with doc