dotnet/coreclr ? reverse-engineered prompt

Build me a simple, polished landing page or README style experience for this repository that clearly tells people this project is archived and that the code now lives in dotnet/runtime.

I want it to explain, in plain language, that CoreCLR was the runtime for .NET Core, and that it includes things like the garbage collector and JIT compiler, but the main action now is to point users to the new home. Please make the page feel clean and official, with a short summary, a prominent link to the new repository, and a brief note about where to go for issues and ongoing development.

If there are any obvious missing details, look up the current docs online if you need to. Keep it lightweight, easy to read, and make sure someone landing here immediately understands what happened and where they should go next.