Add GPL modules

MediaBrowser.Model/Playlists/PlaylistCreationRequest.cs

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+using System.Collections.Generic;
+using System;
+
+namespace MediaBrowser.Model.Playlists
+{
+    public class PlaylistCreationRequest
+    {
+         public string Name { get; set; }
+
+        public Guid[] ItemIdList { get; set; }
+
+        public string MediaType { get; set; }
+
+        public Guid UserId { get; set; }
+
+        public PlaylistCreationRequest()
+        {
+            ItemIdList = Array.Empty<Guid>();
+        }
+    }
+}

MediaBrowser.Model/Playlists/PlaylistCreationResult.cs

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+
+namespace MediaBrowser.Model.Playlists
+{
+    public class PlaylistCreationResult
+    {
+        public string Id { get; set; }
+    }
+}

MediaBrowser.Model/Playlists/PlaylistItemQuery.cs

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+using MediaBrowser.Model.Querying;
+
+namespace MediaBrowser.Model.Playlists
+{
+    public class PlaylistItemQuery
+    {
+        /// <summary>
+        /// Gets or sets the identifier.
+        /// </summary>
+        /// <value>The identifier.</value>
+        public string Id { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user identifier.
+        /// </summary>
+        /// <value>The user identifier.</value>
+        public string UserId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the start index.
+        /// </summary>
+        /// <value>The start index.</value>
+        public int? StartIndex { get; set; }
+
+        /// <summary>
+        /// Gets or sets the limit.
+        /// </summary>
+        /// <value>The limit.</value>
+        public int? Limit { get; set; }
+
+        /// <summary>
+        /// Gets or sets the fields.
+        /// </summary>
+        /// <value>The fields.</value>
+        public ItemFields[] Fields { get; set; }
+    }
+}