D22973: docs: introduce commit message guideline

[Anthony Fieroni]

anthonyfieroni added inline comments.

INLINE COMMENTS

> romangg wrote in HACKING.md:161
> The "Breaking Changes" was copied over from the Angular guide lines, but maybe we should remove it here. For once because we don't really have defined what breaking changes are in KWin. Is a change to the Effects API/ABI a breaking change? Is a behavioral change for users one?

If KWin loads all its modules at start it sounds unchanged to users, otherwise breaking API/ABI will result in crash at time to load an incompatible plugin.

REPOSITORY
  R108 KWin

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

To: romangg, #kwin
Cc: anthonyfieroni, zzag, ngraham, kwin, LeGast00n, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart
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