Add CreativeCore to the mod incompatibility list.

[quinn-semele]

Currently sometimes causes creative search to break and outputs errors when saving due to a accessor mixin failing to apply, can be mitigated by changing playSoundWithOffset in ambient sound's config to false.

Author also states the mod is not compatible with Quilt and to use Fabric instead.

For more information see: CreativeMD/CreativeCore#205

Mod ID: creativecore