Persist playback settings

ios/App/Shared/models/PlayerSettings.swift

@@ -0,0 +1,30 @@
+//
+//  PlayerSettings.swift
+//  App
+//
+//  Created by Ron Heft on 8/18/22.
+//
+
+import Foundation
+import RealmSwift
+
+class PlayerSettings: Object {
+    // The webapp has a persisted setting for playback speed, but it's not always available to the native code
+    // Lets track it natively as well, so we never have a situation where the UI and native player are out of sync
+    @Persisted var playbackRate: Float = 1.0
+    
+    // Singleton pattern for Realm objects
+    static func main() -> PlayerSettings {
+        let realm = try! Realm()
+        
+        if let settings = realm.objects(PlayerSettings.self).last {
+            return settings
+        }
+        
+        let settings = PlayerSettings()
+        try! realm.write {
+            realm.add(settings)
+        }
+        return settings
+    }
+}