feat: Add banner infra.

src/Ursa.Themes.Semi/Controls/Banner.axaml

@@ -0,0 +1,15 @@
+<ResourceDictionary
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:u="https://irihi.tech/ursa">
+    <!--  Add Resources Here  -->
+    <ControlTheme x:Key="{x:Type u:Banner}" TargetType="u:Banner">
+        <Setter Property="u:Banner.Template">
+            <ControlTemplate TargetType="u:Banner">
+                <Border>
+                    <!--    -->
+                </Border>
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Controls/_index.axaml

@@ -0,0 +1,6 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="Banner.axaml" />
+    </ResourceDictionary.MergedDictionaries>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Index.axaml

@@ -0,0 +1,21 @@
+<Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Design.PreviewWith>
+        <Border Padding="20">
+            <!--  Add Controls for Previewer Here  -->
+        </Border>
+    </Design.PreviewWith>
+    <Styles.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.ThemeDictionaries>
+                <ResourceInclude x:Key="Dark" Source="./Themes/Dark/_index.axaml" />
+                <ResourceInclude x:Key="Light" Source="Themes/Light/_index.axaml" />
+            </ResourceDictionary.ThemeDictionaries>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceInclude Source="../Controls/Banner.axaml" />
+                <ResourceInclude Source="Themes/Shared/_index.axaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Styles.Resources>
+
+    <!--  Add Styles Here  -->
+</Styles>

src/Ursa.Themes.Semi/Themes/Dark/Banner.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>

src/Ursa.Themes.Semi/Themes/Dark/_index.axaml

@@ -0,0 +1,6 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="Banner.axaml" />
+    </ResourceDictionary.MergedDictionaries>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Themes/Light/Banner.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>

src/Ursa.Themes.Semi/Themes/Light/_index.axaml

@@ -0,0 +1,6 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="Banner.axaml" />
+    </ResourceDictionary.MergedDictionaries>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Themes/Shared/Banner.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+</ResourceDictionary>

src/Ursa.Themes.Semi/Themes/Shared/_index.axaml

@@ -0,0 +1,6 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  Add Resources Here  -->
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceInclude Source="Banner.axaml" />
+    </ResourceDictionary.MergedDictionaries>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Ursa.Themes.Semi.csproj

@@ -1,22 +1,19 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net7.0</TargetFramework>
+        <TargetFramework>netstandard2.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <LangVersion>11</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Avalonia" Version="11.0.0-preview4" />
+      <PackageReference Include="Avalonia" Version="11.0.0-preview5" />
       <PackageReference Include="XamlNameReferenceGenerator" Version="1.5.1" />
     </ItemGroup>
 
     <ItemGroup>
       <ProjectReference Include="..\Ursa\Ursa.csproj" />
     </ItemGroup>
-
-    <ItemGroup>
-      <Folder Include="Controls" />
-    </ItemGroup>
-
+    
 </Project>