adding not about razor scaffolding

razor-scaffolding-15.3.md

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+Scaffolding for Razor is currently a work in progress. In 15.3 we have shipped the initial set of scaffolders with Visual Studio 2017.
+
+We have enabled some additional scenarios for command line scaffolding. For more info about how to scaffold on the command line for
+Razor projects please see https://docs.microsoft.com/en-us/aspnet/core/tutorials/razor-pages/model.
+
+Over time we will be adding additional support into Visual Studio 2017 for Razor scaffolding.