Vendor dependencies for 0.3.0 release

vendor/rodio/examples/music_m4a.rs

@@ -0,0 +1,11 @@
+use std::io::BufReader;
+
+fn main() {
+    let (_stream, handle) = rodio::OutputStream::try_default().unwrap();
+    let sink = rodio::Sink::try_new(&handle).unwrap();
+
+    let file = std::fs::File::open("assets/music.m4a").unwrap();
+    sink.append(rodio::Decoder::new(BufReader::new(file)).unwrap());
+
+    sink.sleep_until_end();
+}