Update README.md

Added beta website info

Related to #328

README.md

@@ -4,6 +4,18 @@ This repo contains the source code and documentation powering [it.reactjs.org](h
 
 [![CircleCI](https://circleci.com/gh/reactjs/it.reactjs.org.svg?style=svg)](https://circleci.com/gh/reactjs/it.reactjs.org)
 
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+# ⚠ Beta Website ⚠
+We are currently transitioning our translation efforts to the new website that is currently in [Beta](https://github.com/reactjs/reactjs.org/issues/4135).
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+We are early stages and still setting up everything, all the previous translation efforts are stopped. 
+
+Nothing is lost, all the translated content will be archived.
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+As usual you can follow the progress [here (#1)](https://github.com/reactjs/it.reactjs.org/issues/1) and specifically for the transition [here (#328)](https://github.com/reactjs/it.reactjs.org/issues/328)
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+---
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 ## Before we start, some useful links:
 
 - [Glossary](GLOSSARY.md)