Add project files.

Models/AppConfig.cs

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+// 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.
+
+namespace DownloadManager.Models;
+
+public class AppConfig
+{
+    public string ConfigurationsFolder
+    {
+        get; set;
+    }
+
+    public string AppPropertiesFileName
+    {
+        get; set;
+    }
+}

Models/DataColor.cs

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+// 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;
+    }
+}

Models/DownloadItemData.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DownloadManager.Models;
+public class DownloadItemData
+{
+    public required string FileName
+    {
+        get; set;
+    }
+    public required string Url
+    {
+        get; set;
+    }
+    public required long FileSize
+    {
+        get; set;
+    }
+    public required long Speed
+    {
+        get; set;
+    }
+    public required int Progress
+    {
+        get; set;
+    }
+    public required DownloadStatus Status
+    {
+        get; set;
+    }
+}

Models/DownloadStatus.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DownloadManager.Models;
+public enum DownloadStatus
+{
+    Downloading,
+    Pausing,
+    Done,
+    Cancel
+}