Add a readme for the publication

[mordaak]

Hi Chris,

Could you add a readme document to this page to help navigate what to download and how to use it. Make sure the latest and greatest are only here, and rest should be moved to somewhere else. This page will become public soon.

Best,
Ali

[rkrishnasanka]

Cello's README should be the example to strive for - https://github.com/CIDARLAB/cello