doc: Add the Retro Reference Test Case Specification 1.0 section (!96) · Merge requests · GNOME / RetroGTK · GitLab

Adrien Plazas requested to merge aplazas/retro-gtk:doc into master Oct 17, 2020

This is a port of the Retro Reference Test Case Specification 1.0 from https://wiki.gnome.org/Apps/Games/Documentation/RetroReftest, as having it within the retro-gtk documentation makes more sense.