Added new item docs to getting started

docs/getting-started-extension.md

@@ -16,7 +16,10 @@ Windows Template Studio installs into your existing Windows 10 app development e
 ## Public Release instructions
 
 1. Install the Visual Studio Extension for Windows Template Studio by downloading the VSIX from the [Visual Studio Gallery](https://marketplace.visualstudio.com/items?itemName=WASTeamAccount.WindowsTemplateStudio).
-1. Once installed, open Visual Studio 2017 and select File→ New Project→ C# → Windows Universal and you should see Windows Template Studio as an option.
+2. Once installed, open Visual Studio 2017 and select File→ New Project→ C# → Windows Universal and you should see Windows Template Studio as an option.
+3. To add pages and features to an existing Windows Template Studio project, select the project and choose Windows Template Studio → New page or New feature from the context menu. For more info on adding new items see [here](docs/newitem.md).
+![Add new Page/Feature](resources/vsix/addNewItem.PNG)
+
 
 ## Nightly / Pre-release feeds for Windows Template Studio