Add a PLEP workflow to the README.rst. This should (at least) cover... 1. How to start an upload to Zenodo to reserve a DOI. 1. How to fill out the Zenodo metadata. 1. Guideline for getting committee approvals. * It's probably best to do this by getting approvals on the PR, then we have an easily discoverable track record. 1. Finishing Zenodo upload after PLEP acceptance.