Add playlist-sync and group-wait to SyncPlay

MediaBrowser.Model/SyncPlay/GroupShuffleMode.cs

@@ -0,0 +1,18 @@
+namespace MediaBrowser.Model.SyncPlay
+{
+    /// <summary>
+    /// Enum GroupShuffleMode.
+    /// </summary>
+    public enum GroupShuffleMode
+    {
+        /// <summary>
+        /// Sorted playlist.
+        /// </summary>
+        Sorted = 0,
+
+        /// <summary>
+        /// Shuffled playlist.
+        /// </summary>
+        Shuffle = 1
+    }
+}