Draft PR to show work we did in FHL

.gitignore

@@ -234,4 +234,6 @@ msbuild.binlog
 LottieGenOutput-*/
 
 # Visual Studio debugging configuration file.
-launchSettings.json
+launchSettings.json
+
+Generated Files/

CppApp/App.xaml

@@ -0,0 +1,21 @@
+<!-- Copyright (c) Microsoft Corporation.
+     Licensed under the MIT License. -->
+<Application
+    x:Class="CppApp.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:CppApp">
+
+    <Application.Resources>
+        <!-- Application-specific resources -->
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <!-- 
+                    Styles that define common aspects of the platform look and feel
+                    Required by Visual Studio project and item templates
+                 -->
+                <ResourceDictionary Source="ms-appx:///Styles.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

CppApp/App.xaml.cpp

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#include "pch.h"
+
+#include "App.xaml.h"
+#include "MainWindow.xaml.h"
+
+namespace winrt
+{
+    using namespace Windows::Foundation;
+    using namespace Microsoft::UI::Xaml;
+}
+
+namespace winrt::CppApp::implementation
+{
+    App::App()
+    {
+        InitializeComponent();
+
+#if defined _DEBUG && !defined DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
+        UnhandledException([](winrt::IInspectable const&, winrt::UnhandledExceptionEventArgs const& e)
+            {
+                if (IsDebuggerPresent())
+                {
+                    auto errorMessage = e.Message();
+                    __debugbreak();
+                }
+            });
+#endif
+    }
+
+    void App::OnLaunched(winrt::LaunchActivatedEventArgs const&)
+    {
+        window = winrt::make<MainWindow>();
+        window.Activate();
+    }
+}

CppApp/App.xaml.h

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#pragma once
+#include "App.xaml.g.h"
+#include "pch.h"
+
+namespace winrt::CppApp::implementation
+{
+    struct App : AppT<App>
+    {
+        App();
+
+        void OnLaunched(Microsoft::UI::Xaml::LaunchActivatedEventArgs const&);
+
+    private:
+        Microsoft::UI::Xaml::Window window{ nullptr };
+    };
+}