It's best practise to add a README.md and LICENSE.md to your super repo. Both of these files are in markdown format and the README will automatically be presented on github.com.
The README should have the following information on what the purpose of your super repo is, and how to install it.
The LICENSE.md should contain information about what license the repo falls under.
Once you have created the files, add them to git.
git add README.md LICENSE.md