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/winforms/advanced/application-settings-overview.md

@@ -2,6 +2,7 @@
 title: "Application Settings Overview"
 description: Learn about the Application Settings feature of Windows Forms, for example how to create and store settings data on behalf of your application and your users.
 ms.date: "03/30/2017"
+ms.topic: overview
 f1_keywords:
   - "ApplicationsSettingsOverview"
 helpviewer_keywords:

dotnet-desktop-guide/framework/winforms/advanced/overview-of-graphics.md

@@ -1,6 +1,7 @@
 ---
 title: "Overview of Graphics"
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "graphics [Windows Forms], using managed interface"
   - "graphics [Windows Forms], about graphics"

dotnet-desktop-guide/framework/winforms/advanced/types-of-bitmaps.md

@@ -2,6 +2,7 @@
 title: "Types of Bitmaps"
 description: Learn about bitmap types and the supported GDI+ graphics file formats, including BMP, JPG, GIF, PNG, and TIFF.
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "jpeg files"
   - "TIFF files"

dotnet-desktop-guide/framework/winforms/advanced/types-of-coordinate-systems.md

@@ -1,6 +1,7 @@
 ---
 title: "Types of Coordinate Systems"
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs: 
   - "csharp"
   - "vb"

dotnet-desktop-guide/framework/winforms/advanced/vector-graphics-overview.md

@@ -1,6 +1,7 @@
 ---
 title: "Vector Graphics Overview"
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs: 
   - "csharp"
   - "vb"

dotnet-desktop-guide/framework/winforms/advanced/windows-forms-and-unmanaged-applications-overview.md

@@ -1,6 +1,7 @@
 ---
 title: Unmanaged apps overview
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "COM [Windows Forms]"
   - "Windows Forms, unmanaged"