adding 2.0 info

install-2.0-vs15.3.md

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+To get started with .NET Core 2.0 in Visual Studio 2017 follow the steps below.
+
+ - Install .NET Core 2.0 -  https://www.microsoft.com/net/core
+ - Restart Visual Studio 2017
+
+After these steps you can create new projects in the New Project Dialog. For docs please see https://docs.microsoft.com/en-us/aspnet/core/.