Add missing GetFileIcon method

ElectronNET.API/App.cs

@@ -1307,6 +1307,13 @@ namespace ElectronNET.API
             BridgeConnector.Emit("appSetAboutPanelOptions", JObject.FromObject(options, _jsonSerializer));
         }
 
+        /// <summary>
+        /// Fetches a path's associated icon.
+        /// </summary>
+        /// <param name="type"></param>
+        /// <returns></returns>
+        public Task<NativeImage> GetFileIcon(string path) => BridgeConnector.OnResult<NativeImage>("appGetFileIcon", "appGetFileIconCompleted", path);
+
         /// <summary>
         /// A <see cref="string"/> which is the user agent string Electron will use as a global fallback.
         /// <para/>