Update metadata rules and individual articles (#142)

* Add conceptual topic type for framework

* Add NET WPF article topic types

* Framework winforms overview topic types

* Update metadata

* Update walkthrough-my-first-wpf-desktop-application.md

dotnet-desktop-guide/net/wpf/fundamentals/styles-templates-create-apply-style.md

@@ -4,6 +4,7 @@ description: Learn how to create and reference a control style in Windows Presen
 author: adegeo
 ms.author: adegeo
 ms.date: 09/12/2019
+ms.topic: conceptual
 dev_langs:
   - "csharp"
   - "vb"

dotnet-desktop-guide/net/wpf/fundamentals/styles-templates-overview.md

@@ -4,6 +4,7 @@ description: Learn about XAML resources in Windows Presentation Foundation (WPF)
 author: adegeo
 ms.author: adegeo
 ms.date: 09/09/2019
+ms.topic: overview
 dev_langs: 
   - "csharp"
   - "vb"

dotnet-desktop-guide/net/wpf/fundamentals/xaml-resources-define.md

@@ -4,6 +4,7 @@ description: Learn about XAML resources in WPF for .NET Core. Understand the typ
 author: adegeo
 ms.author: adegeo
 ms.date: 08/21/2019
+ms.topic: overview
 ---
 
 # Overview of XAML resources

dotnet-desktop-guide/net/wpf/fundamentals/xaml.md

@@ -4,6 +4,7 @@ description: Learn how the XAML language is structured and implemented by Window
 author: adegeo
 ms.date: 08/08/2019
 ms.author: adegeo
+ms.topic: overview
 dev_langs:
   - "csharp"
   - "vb"