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/framework/wpf/app-development/building-a-wpf-application-wpf.md

@@ -1,6 +1,7 @@
 ---
 title: "Compile an app"
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs:
   - "csharp"
   - "vb"