Add copyright notices to newly added files.

Author: pieths-ms

SampleApps/webview2_sample_uwp/Pages/SettingsPage.xaml

@@ -1,4 +1,8 @@
-<Page
+<!--Copyright (C) Microsoft Corporation. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.-->
+
+<Page
     x:Class="WebView2_UWP.Pages.SettingsPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

SampleApps/webview2_sample_uwp/Pages/SettingsPage.xaml.cs

@@ -1,4 +1,8 @@
-using Microsoft.UI.Xaml.Controls;
+// Copyright (C) Microsoft Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+using Microsoft.UI.Xaml.Controls;
 using System;
 using System.Collections.ObjectModel;
 using System.ComponentModel;

SampleApps/webview2_sample_uwp/Settings.cs

@@ -1,4 +1,8 @@
-using System;
+// Copyright (C) Microsoft Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+using System;
 using Windows.Foundation.Collections;
 using Windows.Storage;
 

SampleApps/webview2_sample_uwp/WebView2Extensions.cs

@@ -1,4 +1,8 @@
-using Microsoft.UI.Xaml.Controls;
+// Copyright (C) Microsoft Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+using Microsoft.UI.Xaml.Controls;
 using Microsoft.Web.WebView2.Core;
 using System.ComponentModel;
 using System.Diagnostics;