Add project files.

ViewModels/Windows/MainWindowViewModel.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.Collections.ObjectModel;
+using Wpf.Ui.Controls;
+
+namespace DownloadManager.ViewModels.Windows;
+public partial class MainWindowViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private string _applicationTitle = "WPF UI - Downloader";
+
+    [ObservableProperty]
+    private ObservableCollection<object> _menuItems = new()
+    {
+        new NavigationViewItem()
+        {
+            Content = "Home",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.Home24 },
+            TargetPageType = typeof(Views.Pages.DashboardPage)
+        },
+        new NavigationViewItem()
+        {
+            Content = "Data",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.DataHistogram24 },
+            TargetPageType = typeof(Views.Pages.DataPage)
+        }
+    };
+
+    [ObservableProperty]
+    private ObservableCollection<object> _footerMenuItems = new()
+    {
+        new NavigationViewItem()
+        {
+            Content = "Settings",
+            Icon = new SymbolIcon { Symbol = SymbolRegular.Settings24 },
+            TargetPageType = typeof(Views.Pages.SettingsPage)
+        }
+    };
+
+    [ObservableProperty]
+    private ObservableCollection<MenuItem> _trayMenuItems = new()
+    {
+        new MenuItem { Header = "Home", Tag = "tray_home" }
+    };
+}