Added the scaffolding

shanty-play/src/lib.rs

@@ -0,0 +1,4 @@
+//! Built-in music playback.
+//!
+//! Provides basic audio playback capabilities, including a built-in web player
+//! component for the Shanty web interface.

shanty-play/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("shanty-play: built-in music playback");
+}