Reintroduce Track and User models

src/models/Track.ts

@@ -0,0 +1,18 @@
+import type { User } from './User';
+
+export interface Track {
+  added_at: string;
+  album: {
+    name: string;
+    url: string;
+  };
+  artists: User[];
+  duration_ms: number;
+  name: string;
+  url: string;
+  date_added: string;
+  date_added_asterisk: boolean;
+  date_removed: string | null;
+  position?: string;
+  retention?: number;
+}

src/models/User.ts

@@ -0,0 +1,4 @@
+export interface User {
+  name: string;
+  url: string;
+}