categories many-to-many
this thing's only purpose will be so that you could have a, for example, "Wii Sports golf" game and then have categories under it like "9 holes", "intermediate x3", etc. and then you would either have only an elo for that or have elos for everything. this isnt the best example but idk if it would be cool to have this for other games
do not do this read next comment
the main thing to do to turn this from a wii golf thing to an all games thing is to make a db model for Games
make a new Game model that has
turn what is currently called "Game" into "Category" and associate these Category with their Games