Add Tutorials index

docs/core/tutorials/index.md

@@ -0,0 +1,22 @@
+---
+title: .NET Core Tutorials
+description: .NET Core Tutorials
+keywords: .NET, .NET Core
+author: richlander
+manager: wpickett
+ms.date: 06/24/2016
+ms.topic: article
+ms.prod: .net-core
+ms.technology: .net-core-technologies
+ms.devlang: dotnet
+ms.assetid: f6f654b1-1d2c-4105-8376-7c1959e23803
+---
+
+.NET Core Tutorials
+===================
+
+The following tutorials are available for learning about .NET Core.
+
+- [Using .NET Core on Windows](using-on-macos.md)
+- [Using .NET Core on macOS](using-on-macos.md)
+- [Using .NET Core on the Command-Line](using-with-xplat-cli.md)