Decide workflow and document pushing Cohort repo README & images to repo

[stefaniebutland]

do we push or upload README.md and horst-champions-trailhead.png to repo OR should we be pushing whole local repo folder?

Copied from Create GitHub repo with README

# We still need to work out the next part of the workflow and the extent to
# which it should be automated, but I imagine something like:
#
# 1. Move README.Rmd out of this repository to another repository that perhaps 
# only contains README.Rmds.
# 2. Git add, commit, and push in the repo that only contains README.Rmds.
# 3. Git add, commit, and push in this repository.