Update README.md: add link to Jupyterhub youtubevideo, notebook name conventions, and developers workflow (!20) · Merge requests · data-infrastructure-services / tutorials-and-use-cases

Ghost User requested to merge patch-2 into master Dec 15, 2020

These modifications were already approved in the meetings, I request and accept the merge on my own.

Update README.md: add link to Jupyterhub youtubevideo, notebook name conventions, and developers workflow