Extend the FAIR principles with GitHub intergration

[krzysztof]

As suggested by @jbenito3
In FAIR we could expand a bit more on GitHub integration in general, and specifically in F4 about searching in GitHub using Zenodo DOIs (although we only kind-of "register" the DOI in GitHub search since it's the users that have to put the badge there).

Example:
https://github.com/gcowan/hyperk/search?utf8=%E2%9C%93&q=10.5281%2Fzenodo.160400
https://github.com/search?q=10.5281%2Fzenodo&type=Code