Add FAQ for workflow bestpractices / how to add author information & license.

[hexylena]

Here's what I posted in a comment:

Here's where you find the best practices:

Following through with the suggestions will let you fix all best-practice issues:

Or if you just want to fix the linting complaints and nothing else, this can be done from the edit tab:

Originally posted by @hexylena in https://github.com/galaxyproject/training-material/pull/4492#discussion_r1389101107