feat: add demo.

demo/Ursa.Demo/Models/MenuKeys.cs

@@ -6,6 +6,7 @@ public static class MenuKeys
     public const string MenuKeyBadge = "Badge";
     public const string MenuKeyBanner = "Banner";
     public const string MenuKeyButtonGroup = "ButtonGroup";
+    public const string MenuKeyBreadcrumb = "Breadcrumb";
     public const string MenuKeyClassInput = "Class Input";
     public const string MenuKeyDialog = "Dialog";
     public const string MenuKeyDivider = "Divider";

demo/Ursa.Demo/Pages/BreadcrumbDemo.axaml

@@ -0,0 +1,15 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:u="https://irihi.tech/ursa"
+             mc:Ignorable="d" d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="Ursa.Demo.Pages.BreadcrumbDemo">
+    <StackPanel>
+        <u:Breadcrumb>
+            <TextBlock Text="Hello"></TextBlock>
+            <u:BreadcrumbItem Content="World" Icon="?"></u:BreadcrumbItem>
+        </u:Breadcrumb>
+    </StackPanel>
+</UserControl>

demo/Ursa.Demo/Pages/BreadcrumbDemo.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Ursa.Demo.Pages;
+
+public partial class BreadcrumbDemo : UserControl
+{
+    public BreadcrumbDemo()
+    {
+        InitializeComponent();
+    }
+}

demo/Ursa.Demo/ViewModels/BreadcrumbDemoViewModel.cs

@@ -0,0 +1,8 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public class BreadcrumbDemoViewModel: ObservableObject
+{
+    
+}

demo/Ursa.Demo/ViewModels/MainViewViewModel.cs

@@ -28,6 +28,7 @@ public class MainViewViewModel : ViewModelBase
             MenuKeys.MenuKeyBadge => new BadgeDemoViewModel(),
             MenuKeys.MenuKeyBanner => new BannerDemoViewModel(),
             MenuKeys.MenuKeyButtonGroup => new ButtonGroupDemoViewModel(),
+            MenuKeys.MenuKeyBreadcrumb => new BreadcrumbDemoViewModel(),
             MenuKeys.MenuKeyClassInput => new ClassInputDemoViewModel(),
             MenuKeys.MenuKeyDialog => new DialogDemoViewModel(),
             MenuKeys.MenuKeyDivider => new DividerDemoViewModel(),

demo/Ursa.Demo/ViewModels/MenuViewModel.cs

@@ -14,6 +14,7 @@ public class MenuViewModel: ViewModelBase
             new() { MenuHeader = "Controls", IsSeparator = true },
             new() { MenuHeader = "Badge", Key = MenuKeys.MenuKeyBadge, Status = "Updated"},
             new() { MenuHeader = "Banner", Key = MenuKeys.MenuKeyBanner },
+            new() { MenuHeader = "Breadcrumb", Key = MenuKeys.MenuKeyBreadcrumb, Status = "New" },
             new() { MenuHeader = "Button Group", Key = MenuKeys.MenuKeyButtonGroup},
             new() { MenuHeader = "Class Input", Key = MenuKeys.MenuKeyClassInput, Status = "New" },
             new() { MenuHeader = "Dialog", Key = MenuKeys.MenuKeyDialog, Status = "Updated"},