Please add instructions for the .ini files for Mac into the ReadMe
The location is
/Users/USER/Library/Application Support/Slippi Launcher/netplay/Slippi Dolphin.app/Contents/Resources/Sys/Config/Profiles/GCPad
To get into to it, you have to first go to /Users/USER/Library/Application\ Support/Slippi\ Launcher/netplay/Slippi\ Dolphin.app/, right click on Dolphin.app, and click "open contents", then you have to navigate to Contents/Resources/Sys/Config/Profiles/GCPad and put the .ini files there.