Added note about project being archived

Author: mkArtakMSFT

README.md

@@ -1,8 +1,9 @@
 # JavaScriptServices [Archived]
 
-**This GitHub project has been archived.** Ongoing development on this project can be found in <https://github.com/aspnet/AspNetCore>.
+## IMPORTANT
+
+The features described in this article are obsolete as of ASP.NET Core 3.0. A simpler SPA frameworks integration mechanism is available in the [Microsoft.AspNetCore.SpaServices.Extensions](https://www.nuget.org/packages/Microsoft.AspNetCore.SpaServices.Extensions) NuGet package. For more information, see [[Announcement] Obsoleting Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices](https://github.com/dotnet/AspNetCore/issues/12890).
 
-This project is part of ASP.NET Core. You can find samples, documentation and getting started instructions for ASP.NET Core at the [AspNetCore](https://github.com/aspnet/AspNetCore) repo.
 
 ## What is this?