Add howto doc for setting up Gitlab.com OAuth

Taurie Davisrequested to merge
gitlab-oauth2 into master

What does this Merge Request do?

Adds instructions on how to set up Gitlab.Com OAuth with your local gitlab instance

Merge Request checklist

  • [-] Tests added for new functionality. If not, please raise Issue to follow-up.
  • [-] This change is backward compatible. If not, please include steps to communicate to our users.
  • [-] Documentation added/updated, if needed.
  • [-] gdk doctor test added, if needed.

I don't think the above are relevant 🤔

Edited by 🤖 GitLab Bot 🤖

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