chore: Full screen mode sample

Author: MartinZikmund

UI/WindowingSamples/WindowingSamples/FullScreenModeWindow.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Window
+    x:Class="WindowingSamples.FullScreenModeWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="using:WindowingSamples.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+  <Grid>
+    <Grid.RowDefinitions>
+      <RowDefinition Height="Auto" />
+      <RowDefinition Height="*" />
+    </Grid.RowDefinitions>
+    <controls:WindowTitleControl Text="Full screen mode" Glyph="&#xE740;" />
+
+    <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="1" Spacing="8">
+      <TextBlock HorizontalAlignment="Center" Text="This is a full screen window" FontSize="20" />
+      <Button HorizontalAlignment="Center" Click="{x:Bind Close}">Close me</Button>
+    </StackPanel>
+  </Grid>
+</Window>

UI/WindowingSamples/WindowingSamples/FullScreenModeWindow.xaml.cs

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+using Microsoft.UI.Windowing;
+
+namespace WindowingSamples;
+
+/// <summary>
+/// An empty window that can be used on its own or navigated to within a Frame.
+/// </summary>
+public sealed partial class FullScreenModeWindow : Window
+{
+    public FullScreenModeWindow()
+    {
+        InitializeComponent();
+    }
+}