Add a notice about the company list on the "Console support in Godot"

It might not be immediately obvious that companies can be added
to the list by simply requesting it in an issue
(or making a pull request). This should make it more evident.

tutorials/platform/consoles.rst

@@ -33,3 +33,8 @@ Following is the list of providers:
 
 * `Lone Wolf Technology <http://www.lonewolftechnology.com/>`_ offers
   Switch, PS4 and Xbox One porting and publishing of Godot games.
+
+If your company offers porting and/or publishing services for Godot games,
+feel free to
+`open an issue or pull request <https://github.com/godotengine/godot-docs>`_
+to add your company to the list above.