This commit adds the dag-sharding-rfc file to the docs directory.
This file outlines the DAG sharding project and currently contains
the draft posted to ipfs/notes for feedback. As suggestions are
incorporated this document will be reworked to track the consensus
on the project's goals and implementation.
License: MIT
Signed-off-by: Wyatt Daviau <wdaviau@cs.stanford.edu>
