chore: update readme

Author: Selnapenek

README.md

@@ -1,3 +1,9 @@
+## This repo is deprecated
+- Contains only the first version of 8base-reack-sdk.
+- The new version of react-sdk was merged with core SDK.
+- Please refer to new [up-to-date repo](https://github.com/8base/sdk/tree/master/packages/react).
+
+
 # 8base React SDK
 
 This repository contains a set of SDK packages to make it easier to use 8base with React.