Add MusicPlayerSingleton class in Samples

Author: Aestial

Samples~/Singleton/Runtime/MusicPlayerSingleton.cs

@@ -0,0 +1,26 @@
+using OpenMusicPlayer.Core;
+
+namespace OpenMusicPlayer.Samples.Singleton
+{
+    public class MusicPlayerSingleton: MusicPlayerCore
+    {
+        public static MusicPlayerSingleton Instance {get; private set;}
+        
+        protected override void Awake()
+        {
+            base.Awake();
+            // Make unique object (Singleton)
+            if (Instance != null && Instance != this)
+            {
+                // Destroy other
+                Destroy(gameObject);
+            }
+            else
+            {
+                Instance = this;
+                // Add don't destroy on load.
+                DontDestroyOnLoad(this);
+            }
+        }
+    }
+}

package.json

@@ -7,7 +7,7 @@
         "url": "https://github.com/Aestial"
     },
     "license": "MIT",
-    "version": "0.1.7",
+    "version": "0.1.8",
     "unity": "2019.4",
     "description": "Open and simple music playback system based on Events and ScriptableObjects playlists",
     "keywords": [
@@ -40,7 +40,12 @@
       {
           "displayName": "HUD Samples",
           "description": "Multiple music player HUD views",
-          "path": "Samples~/HUD"          
+          "path": "Samples~/HUD" 
+      },
+      {
+        "displayName": "Singleton Player",
+        "description": "Don't Destroy On Load singleton wrapper",
+        "path": "Samples~/Singleton"
       }
   ]   
 }