Create a default account from PLAYER_USER/PLAYER_PASSWORD

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

@@ -19,3 +19,16 @@ Only MP3/M4B files can be played in a browser; convert Audible `.aax`/`.aaxc` bo
 - Credentials and user data live in `config.json`, `users.json`, `sessions.json`, `progress_users.json` (git-ignored).
 - Only read-only OpenAudible endpoints are proxied; admin commands and import are blocked.
 - Traffic is plain HTTP. Use a VPN (e.g. Tailscale) or a TLS reverse proxy for access outside your home network.
+
+## Docker
+
+```bash
+# .env next to docker-compose.yml
+OPENAUDIBLE_USER=...
+OPENAUDIBLE_PASSWORD=...
+PLAYER_USER=nate          # default account, created on first start
+PLAYER_PASSWORD=...
+```
+
+`docker compose up -d`, then sign in at port 8080. The default account is only created if it doesn't exist, so changing its password later with
+`docker exec -it audiobook-player python server.py passwd nate` sticks. Add more people with `adduser`.