docs: permission documentation

README.md

@@ -58,6 +58,12 @@ I primarily built Auxio for myself, but you can use it too, I guess.
 - Liked songs
 - More notification actions
 
+## Permissions
+
+- Storage (`READ_EXTERNAL_STORAGE`): to read and play your media files
+- Services (`FOREGROUND_SERVICE`, `WAKE_LOCK`): to keep the music playing even if the app itself is in background
+- Network (`ACCESS_NETWORK_STATE`): unknown
+
 ## Contributing
 
 Auxio accepts most contributions as long as they follow the [Contribution Guidelines](/.github/CONTRIBUTING.md).