Add add_to_queue to Spirc

Author: ralph

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- [connect] Add method `add_to_queue` to `Spirc` to add a track to the queue
+
 ### Changed
 
 - [core] Made `SpotifyId::to_base62`, `SpotifyId::to_base16`, `FileId::to_base16`, `SpotifyUri::to_id`, `SpotifyUri::to_uri` infallible (breaking)