[git] Co-authored-by: name

Co-authored-by.md

$ git commit -m "Refactor usability tests.
> this is the end of the commit message.
>
> 
Co-authored-by: name <name@example.com>
Co-authored-by: another-name <another-name@example.com>"

• Ensure co-authored come after 2 lines from the commit message

See https://help.github.com/en/articles/creating-a-commit-with-multiple-authors for further explanation