Add GPL modules

MediaBrowser.Controller/Providers/MetadataRefreshMode.cs

@@ -0,0 +1,25 @@
+namespace MediaBrowser.Controller.Providers
+{
+    public enum MetadataRefreshMode
+    {
+        /// <summary>
+        /// The none
+        /// </summary>
+        None = 0,
+
+        /// <summary>
+        /// The validation only
+        /// </summary>
+        ValidationOnly = 1,
+
+        /// <summary>
+        /// Providers will be executed based on default rules
+        /// </summary>
+        Default = 2,
+
+        /// <summary>
+        /// All providers will be executed to search for new metadata
+        /// </summary>
+        FullRefresh = 3
+    }
+}