Update README.md

Author: mythz

README.md

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 Follow [@ServiceStack](https://twitter.com/servicestack), [view the docs](https://docs.servicestack.net), use [StackOverflow](https://stackoverflow.com/questions/ask?tags=servicestack,servicestack.redis) or [Customer Forums](https://forums.servicestack.net/) for support.
 
 # Read ServiceStack.Text Docs at [docs.servicestack.net/text](https://docs.servicestack.net/text/)
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+### This repository [has moved](https://docs.servicestack.net/mono-repo) to [github.com/ServiceStack/ServiceStack/ServiceStack.Text](https://github.com/ServiceStack/ServiceStack/tree/main/ServiceStack.Text)