Request: Supporting document-based apps with DocumentGroup

I recently came across the project and wanted to give it a shot for my app, Alidade (https://alidade.dev), but I noticed there doesn't seem to be any support for document-based apps with DocumentGroup. I'd like to request for such functionality in the future, as it would enable a whole class of apps.

These types of apps can provide:

• A document launch experience and browser to let users pick files they want to open, or create a new one
• A document view for reading and writing documents
• Support for common operations such as copy/paste, undo/redo, etc. via conformances to FileDocument and ReferenceFileDocument

More information on document-based apps: https://developer.apple.com/documentation/swiftui/documents

Some things to note:

• DocumentGroup and related APIs like FileWrapper are somewhat of a black box, and there's additional metadata to consider/read from Info.plist.
• From what I've lightly researched, document browsers don't seem to really exist on Android (unless I'm looking in the wrong places on the documentation), so a new view might need to be created for Android specifically.

(I've also kept note of this with alicerunsonfedora/mcmaps#18)

No repository files or tests are identified. Start with the linked SwiftUI documents documentation and review DocumentGroup, FileDocument, ReferenceFileDocument, and Info.plist requirements, then compare them with the project's Android architecture. Done would cover document launch and browsing, document views, and common document operations on the supported platforms.