Add 'ref/' from commit '22eafbcaf6635dc5e1f8a734b1f7c5ab84b5a5ea'

git-subtree-dir: ref
git-subtree-mainline: 50edf34f6dc857c63a6e60748154abed835174ce
git-subtree-split: 22eafbcaf6635dc5e1f8a734b1f7c5ab84b5a5ea

Initial version: obviously trivial module with no functionality.

Adding reference implementation

Update README.md

Initial commit