Add adapter constructor

QuickPlay/SongRecycler.cs

@@ -14,9 +14,10 @@ namespace QuickPlay
 {
     class SongRecyclerAdapter : Android.Support.V7.Widget.RecyclerView.Adapter
     {
+        IPlayer player;
         public SongRecyclerAdapter(IPlayer player)
         {
-            throw new NotImplementedException();
+            this.player = player;
         }
         public override int ItemCount
         {