Add project files.

Models/DataColor.cs

@@ -0,0 +1,15 @@
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Windows.Media;
+
+namespace DownloadManager.Models;
+public struct DataColor
+{
+    public Brush Color
+    {
+        get; set;
+    }
+}