enrol users by username

[Marx1st]

Hi!

It would be great if usernames could be used to enrol users, too.

[abias]

Hi @Marx1st ,

thank you for this issue.
This request would be fulfilled by the PR in #14.
Unfortunately, the review of this PR got stuck on our side as maintainers due to limited resources.

Feel free to test the patch from #14 and share your experience there.

Cheers,
Alex