feat: initialize tag input

demo/Ursa.Demo/Pages/TagInputDemo.axaml

@@ -0,0 +1,12 @@
+<UserControl
+    x:Class="Ursa.Demo.Pages.TagInputDemo"
+    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"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    mc:Ignorable="d">
+    <u:TagInput Margin="20" />
+</UserControl>

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

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

demo/Ursa.Demo/Views/MainWindow.axaml

@@ -47,6 +47,9 @@
             <TabItem Header="Pagination">
                 <pages:PaginationDemo />
             </TabItem>
+            <TabItem Header="TagInput">
+                <pages:TagInputDemo />
+            </TabItem>
             <TabItem Header="Timeline">
                 <pages:TimelineDemo />
             </TabItem>