Add: Documentation for the release process.

[jorgefilipecosta]

This PR just publictly documents the release process that we have been following for the composer package.

[github-actions]

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: jonathanbossenger <psykro@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.46%. Comparing base (41ccde1) to head (2ca361a).
⚠️ Report is 1 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk     #151   +/-   ##
=========================================
  Coverage     80.46%   80.46%           
  Complexity      178      178           
=========================================
  Files            20       20           
  Lines          1474     1474           
  Branches        120      120           
=========================================
  Hits           1186     1186           
  Misses          288      288           

Flag	Coverage Δ
javascript	94.61% <ø> (ø)
unit	76.31% <ø> (ø)

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[jonathanbossenger]

Looks good, just one small change.

[jonathanbossenger]

Probably should be the #core-ai channel.

[jorgefilipecosta]

Good point