README: new features, and a Cassette guide for first-timers

Adds the features shipped since the list was written (Identify Track,
Import from URL, andTunes, art sources, New Tracks, merge improvements,
Cassette) without touching the existing lines, and a step-by-step guide
at the end: installing Syncthing, inviting a friend, choosing what to
share, cassetting songs, following playlists and troubleshooting. Icons
and screenshots in docs/cassette/ are rendered from the app's own
painting code against the synthetic dev library.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
2026-09-28 22:06:35 -07:00
co-authored by Claude Opus 5.5
parent 87d43f8e0c
commit 051312d91d
11 changed files with 203 additions and 0 deletions
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