Add more to GitLab-relevant parts of contributing

Angelos Evripiotisrequested to merge
aevri/contributing_gitlab into master

Description

Add some extra pointers on getting the most out of GitLab for folks new to the project.

Changes proposed in this merge request:

  • Add a note about re-WIPing MRs.
  • Add a note about non-WIP always being landable.
  • Add a note about the 'why' in commit messages.
Edited by Angelos Evripiotis

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