[PostGIS] #5638: Need some more developer documentation

[PostGIS]

#5638: Need some more developer documentation
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  Reporter:  robe           |      Owner:  robe
      Type:  task           |     Status:  new
  Priority:  medium         |  Milestone:  PostGIS 3.5.0
 Component:  documentation  |    Version:  3.4.x
Resolution:                 |   Keywords:
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Comment (by robe):

 I should add this also covers a bit
 https://postgis.net/development/rfcs/rfc05/  but not quite as detailed as
 I'd like and I still feel the developer docs should live in the repo,
 where they can be versioned as our code conventions in our code changes.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5638#comment:1>
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