Add a Readme

[baileythegreen]

and a description to this repo, because it should have one and because people unfamiliar with Jekyll don't stand a chance at figuring out its purpose without either of them.

It looks like USAGE.md is essentially a Readme, but it doesn't get previewed because it's not named Readme, and it may not be obvious to people to look there to understand the purpose of the repo.

[bkmgit]

related to #3

[bkmgit]

The about section of the styles repository indicates there is no README to avoid conflicts, probably same reason for USAGE.md instead of README.md Perhaps the about section of this repository can be updated?

[klieret]

It's different with the styles repository: The styles repository is meant to be used as a template repository and you want to be able to merge changes from the styles repository into the other repositories of the individual lessons afterwards. Hence, if you

1. add readme to styles,
2. start a lesson with the styles repository as template,
3. then change the lesson readme,
4. also change the styles readme along with other changes
5. you now merge the styles repository into the lesson repository to get these changes

you have a merge conflict.

This shouldn't happen here.