Added missing source file headers

Author: Arlodotexe

components/TitleBar/src/InfoHelper.cs

@@ -1,4 +1,8 @@
-#if WINAPPSDK
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#if WINAPPSDK
 using Windows.ApplicationModel;
 using Windows.Storage;
 using Windows.System.Profile;
@@ -33,4 +37,4 @@ static InfoHelper()
             );
     }
 }
-#endif
+#endif

components/TitleBar/src/NativeMethods.cs

@@ -1,4 +1,8 @@
-#if WINAPPSDK
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#if WINAPPSDK
 using System.Runtime.InteropServices;
 
 namespace CommunityToolkit.WinUI.Controls;
@@ -83,4 +87,4 @@ public static IntPtr SetWindowLongAuto(IntPtr hWnd, int nIndex, IntPtr dwNewLong
     [DllImport("user32.dll")]
     public static extern IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, WindowMessage Msg, IntPtr wParam, IntPtr lParam);
 }
-#endif
+#endif