It's pretty easy. They included a folder and dummy files for one game (game 21), all you have to do to add more is copy the process. So for game 22, add a line to the db file in GAME, following the format they describe:
- GAME_ID = numerical identifier, has to be unique
- GAME_TITLE_STRING = Name of the game
- PUBLISHER_NAME = self explanatory
- RELEASE_YEAR = self explanatory
- PLAYERS = number of players
- RATING_IMAGE = Has to be CERO_A
- GAME_MANUAL_QR_IMAGE = Has to be QR_Code_GM
- LINK_GAME_ID = leave empty
Then create a folder named '22', copy over the pcsx.cfg file from folder 21, add your BIN/CUE files (making sure your BIN and CUE files have EXACTLY the same filename - it doesn't matter what you call them, as long as they are the same as each other) and update the db file in DISC, again following the format:
- GAME_ID = GAME_ID from the GAME table
- DISC_NUMBER = disc number
- BASENAME = base name for the cue/bin file pair, i.e: SCUS-94426
BASENAME will be EXACTLY the filename of your BIN/CUE files.
You can repeat this process for adding multiple games - just create a new GAME_ID and corresponding folder for each game (22,23,24,etc.)
Follow the instructions above. One game per folder, and make sure you update the db files at the same time. The guide I followed said only to use BIN/CUE files, and I've had 100% success with them so far.