Add GPL modules

MediaBrowser.Controller/Library/ISearchEngine.cs

@@ -0,0 +1,18 @@
+using MediaBrowser.Model.Querying;
+using MediaBrowser.Model.Search;
+
+namespace MediaBrowser.Controller.Library
+{
+    /// <summary>
+    /// Interface ILibrarySearchEngine
+    /// </summary>
+    public interface ISearchEngine
+    {
+        /// <summary>
+        /// Gets the search hints.
+        /// </summary>
+        /// <param name="query">The query.</param>
+        /// <returns>Task{IEnumerable{SearchHintInfo}}.</returns>
+        QueryResult<SearchHintInfo> GetSearchHints(SearchQuery query);
+    }
+}