add pivot for web and android

Author: rzdor

articles/zone-pivot-groups.yml

@@ -1072,6 +1072,14 @@ groups:
     title: Web
   - id: platform-ios
     title: iOS
+- id: acs-web-android
+  title: Platform
+  prompt: Choose a platform
+  pivots:
+  - id: platform-web
+    title: Web
+  - id: platform-android
+    title: Android    
 - id: acs-js-csharp-ios-android-python
   title: Programming languages
   prompt: Choose a programming language