Add library sort view of "Date Added"

[Athena-plex]

It would be really nice to be able to sort the list of books by date added.

[T4g1]

That information is not stored in the database yet. But we can maybe do without: The audiobook could be sorted on technical ID so theorically, they will be shown in the order they were added (not sure it's a good idea though)

That being said, other *Arr store that information and allow that sorting