Add a shared folder accessible to all apps/games

It'd be great if the Playdate had a shared folder accessible by all apps or games. Currently, if an app lets a user add custom data, it must be done through the app‘s own custom data folder (in /Data/ I think this falls short for apps like music or video players, where a user must duplicate its files across all apps.

There are already a few media players that would benefit from this:


Might be neat for sharing characters/custom maps/progress/awards/etc. between different games in a series, too.