[GRASS-git] [OSGeo/grass] 2bf3cd: contributing: Add readme to development doc (#2962)

[Vaclav Petras]

  Branch: refs/heads/releasebranch_8_3
  Home:   https://github.com/OSGeo/grass
  Commit: 2bf3cd4b44e6f3e16807b9efed2ae24fb1b977c0
      https://github.com/OSGeo/grass/commit/2bf3cd4b44e6f3e16807b9efed2ae24fb1b977c0
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2023-05-23 (Tue, 23 May 2023)

  Changed paths:
    A doc/development/README.md

  Log Message:
  -----------
  contributing: Add readme to development doc (#2962)

This adds a readme file to doc/development. It contains info which was originally in the main readme, but it misses some info useful for navigating the files under doc/development.

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Co-authored-by: Markus Neteler <neteler at osgeo.org>
Co-authored-by: Loïc Bartoletti <lbartoletti at users.noreply.github.com>