Restore WPF .NET Framework content from WPF .NET (#144)

* Copy .NET 5 WPF content back into .NET Framework

* Add H1 heading difference for .NET

* Fix validation errors

dotnet-desktop-guide/framework/wpf/controls/snippets/how-to-create-apply-template/vb/Application.xaml

@@ -0,0 +1,9 @@
+<Application x:Class="Application"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:IntroToStylingAndTemplating"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

dotnet-desktop-guide/framework/wpf/controls/snippets/how-to-create-apply-template/vb/Application.xaml.vb

@@ -0,0 +1,6 @@
+Class Application
+
+    ' Application-level events, such as Startup, Exit, and DispatcherUnhandledException
+    ' can be handled in this file.
+
+End Class

dotnet-desktop-guide/framework/wpf/controls/snippets/how-to-create-apply-template/vb/MainWindow.xaml

@@ -0,0 +1,18 @@
+<Window x:Class="MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:IntroToStylingAndTemplating"
+        mc:Ignorable="d"
+        Title="Template Intro Sample" Loaded="WindowLoaded" SizeToContent="WidthAndHeight" MinWidth="250">
+    <Window.Resources>
+
+    </Window.Resources>
+    <StackPanel Margin="10">
+        <Label>Unstyled Button</Label>
+        <Button>Button 1</Button>
+        <Label>Rounded Button</Label>
+        <Button>Button 2</Button>
+    </StackPanel>
+</Window>

dotnet-desktop-guide/framework/wpf/controls/snippets/how-to-create-apply-template/vb/MainWindow.xaml.vb

@@ -0,0 +1,6 @@
+Class MainWindow
+
+    Private Sub WindowLoaded(sender As Object, e As Windows.RoutedEventArgs)
+
+    End Sub
+End Class

dotnet-desktop-guide/framework/wpf/controls/snippets/how-to-create-apply-template/vb/VBExample.vbproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>IntroToStylingAndTemplating</RootNamespace>
+    <UseWpf>true</UseWpf>
+    <AssemblyName>IntroToStylingAndTemplating</AssemblyName>
+  </PropertyGroup>
+
+</Project>