D22973: docs: introduce commit message guideline

romangg created this revision.
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REVISION SUMMARY
  We did not have an official guideline on how commit messages are supposed to
  be formatted.
  
  Inofficially we used something like [compositor] or [platforms/drm] as tags on
  the subject line. But the square brackets in the beginning can lead to issues
  with certain tools.
  
  This patch specifies an official guideline which is mostly based on the one
  developed in the Angular project:
  https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
  
  Using the existing guideline of another big open source project mostly
  unchanged hopefully allows us to set this guideline once and without major
  changes afterwards.
  
  Some details had to be changed though to take account of KWin's different
  programming language and internal structure.

REPOSITORY
  R108 KWin

BRANCH
  commitMessageGuideline

REVISION DETAIL
  https://phabricator.kde.org/D22973

AFFECTED FILES
  HACKING.md

To: romangg, #kwin
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