hide xplat version of add a model (#3118)

aspnetcore/tutorials/first-mvc-app-xplat/adding-model.md

@@ -12,6 +12,7 @@ ms.technology: aspnet
 ms.prod: asp.net-core
 uid: tutorials/first-mvc-app-xplat/adding-model
 ---
+<!--
 [!INCLUDE[adding-model](../../includes/mvc-intro/adding-model1.md)]
 
 * Add a folder named *Models*.
@@ -104,3 +105,4 @@ You now have a database and pages to display, edit, update and delete data. In t
 <!--
 [Next Working with SQL](working-with-sql.md)  
 -->
+-->

aspnetcore/tutorials/first-mvc-app-xplat/index.md

@@ -19,12 +19,11 @@ This series of tutorials will teach you the basics of building an ASP.NET Core M
 1. [Getting started](start-mvc.md)
 2. [Adding a controller](adding-controller.md)
 3. [Adding a view](adding-view.md)
-4. [Adding a model](adding-model.md)
 
 This is a work in progress. See the [Visual Studio versions ](xref:tutorials/first-mvc-app/index) of the remaining tutorials.
 
 <!--
-
+4. [Adding a model](adding-model.md)
 5. [Working with SQL Server LocalDB](working-with-sql.md)
 6. [Controller methods and views](controller-methods-views.md)
 7. [Adding Search](search.md)