Update README.md

README.md

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 Explore and experiment with private Apple Music API endpoints. 
 
 Note: Do NOT ship with this package. If you do, you are responsible for any backlash from Apple. This uses private Apple Music API endpoints that requires a priviledged developer token.
+
+## Search Replay Playlists
+
+The `searchSummaries(developerToken:)` method allows you to search music summary data for the user's library like the replay playlists over the years. To use this method, you will need a priviledged developer token.
+
+Here's an example of how to use it:
+
+```swift
+do {
+  let summaries = try await MReplay.searchSummaries(developerToken: "developer_token")
+
+  for summary in summaries {
+    print("Year: \(summary.year), playlist: \(summary.playlist)")
+  }
+} catch {
+  print(error)
+}
+```