feat: Add HoneycombPanel and demo.

src/Avalonia/HandyControlDemo_Avalonia/ViewModel/Controls/HoneycombPanelDemoViewModel.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.ObjectModel;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace HandyControlDemo.ViewModel;
+
+public partial class HoneycombPanelDemoViewModel : ObservableObject
+{
+    private static readonly Random Random = new();
+
+    [ObservableProperty] private ObservableCollection<Bitmap> _dataList = [];
+
+    public HoneycombPanelDemoViewModel()
+    {
+        for (int i = 0; i < 7; i++)
+        {
+            DataList.Add(LoadRandomAvatar());
+        }
+    }
+
+    [RelayCommand]
+    private void AddItem() => DataList.Insert(0, LoadRandomAvatar());
+
+    [RelayCommand]
+    private void RemoveItem()
+    {
+        if (DataList.Count > 0)
+        {
+            DataList.RemoveAt(0);
+        }
+    }
+
+    private static Bitmap LoadRandomAvatar()
+    {
+        var uri = new Uri($"avares://HandyControlDemo/Resources/Img/Avatar/avatar{Random.Next(1, 7)}.png");
+        using var stream = AssetLoader.Open(uri);
+        return new Bitmap(stream);
+    }
+}