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/graphics-multimedia/3-d-graphics-overview.md

@@ -2,6 +2,7 @@
 title: "3D Graphics Overview"
 description: Get acquainted with 3D graphics in Windows Presentation Foundation (WPF) to draw, transform, and animate 3D graphics in both markup and procedural code.
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs: 
   - "csharp"
   - "vb"

dotnet-desktop-guide/framework/wpf/graphics-multimedia/3-d-transformations-overview.md

@@ -1,6 +1,7 @@
 ---
 title: "3D Transformations Overview"
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs: 
   - "csharp"
   - "vb"

dotnet-desktop-guide/framework/wpf/graphics-multimedia/animation-overview.md

@@ -2,6 +2,7 @@
 title: "Animation Overview"
 description: Make an attractive user interface even more spectacular with dramatic screen transitions or vivid visual cues in Windows Presentation Foundation (WPF).
 ms.date: "03/30/2017"
+ms.topic: overview
 dev_langs:
   - "csharp"
   - "vb"

dotnet-desktop-guide/framework/wpf/graphics-multimedia/bitmap-effects-overview.md

@@ -1,6 +1,7 @@
 ---
 title: "Bitmap Effects Overview"
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "bitmap effects [WPF]"
 ms.assetid: 23cb338e-4b59-4b52-b294-96431f9c9568

dotnet-desktop-guide/framework/wpf/graphics-multimedia/brush-transformation-overview.md

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

dotnet-desktop-guide/framework/wpf/graphics-multimedia/custom-animations-overview.md

@@ -1,6 +1,7 @@
 ---
 title: "Custom Animations Overview"
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "custom classes [WPF], animation"
   - "key frames [WPF], custom"

dotnet-desktop-guide/framework/wpf/graphics-multimedia/drawing-objects-overview.md

@@ -2,6 +2,7 @@
 title: "Drawing Objects Overview"
 description: Get acquainted with objects and how to use them to efficiently draw shapes, bitmaps, text, and media in Windows Presentation Foundation (WPF).
 ms.date: "03/30/2017"
+ms.topic: overview
 helpviewer_keywords: 
   - "ImageDrawing objects [WPF]"
   - "GlyphRunDrawing objects [WPF]"