Create interfaces for calendar entry and playlist

models/calendar-entry.ts

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+export interface CalendarEntry {
+  snapshotId: string;
+  commitSha: string;
+  dateCaptured: string;
+}

models/owner.ts

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+export interface Owner {
+  name: string;
+  url: string;
+}

models/playlist.ts

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+import { Owner } from './owner';
+import { Track } from './track';
+
+export interface Playlist {
+  description: string;
+  num_followers: number;
+  original_name: string;
+  owner: Owner;
+  snapshot_id: string;
+  tracks: Track[];
+  unique_name: string;
+  url: string;
+}

models/track.ts

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+import { Owner } from './owner';
+
+export interface Track {
+  added_at: string;
+  album: {
+    name: string;
+    url: string;
+  };
+  artists: Owner[];
+  duration_ms: number;
+  name: string;
+  url: string;
+}