Update README.md - archive

Author: akanoce

README.md

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 # Aave SDK
 
+## This repo has been archived. Please use [the official SDK](https://aave.com/docs/developers/aave-v3/getting-started/react).
+
 ## [Aave V3 React is out!](https://www.npmjs.com/package/aave-v3-react)
 
 ![banner](https://github.com/akanoce/react-aave-sdk/blob/main/assets/banner.jpg)