WIP: Preparing the codebase, nothing important

Signed-off-by: Nikolai Rodionov <allanger@badhouseplants.net>

lib/src/track.rs

@@ -0,0 +1,15 @@
+use crate::metadata::Metadata;
+
+use super::region::Region;
+
+pub(crate) enum TrackType {
+    Audio,
+    Midi,
+}
+
+pub(crate) struct Track {
+    metadata: Metadata,
+    track_type: TrackType,
+}
+
+pub(crate) struct TrackStatus {}