Add project files.

ViewModels/Pages/DashboardViewModel.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.ViewModels.Pages;
+
+public partial class DashboardViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private int _counter = 0;
+
+    [RelayCommand]
+    private void OnCounterIncrement()
+    {
+        Counter++;
+    }
+}