I'm very new to attract mode. I started with an image which was already set up very well. A bunch of categories are already configured for each emulator, then there are a number of categories which pull a list with ROMs from different emulators such as "Fighting Games" and "Zelda Games". I would like to add a new category for "Trackball Games" and select which ROMs are in that list - but I'm not really sure where to start. I'm running on a Raspberry Pi. Any guides for doing something like this?