Update README.md

Signed-off-by: fulleni <fulleni@hotmail.com>

Author: fulleni

README.md

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 # HT Authentication Repository
 
+> **Note:** This package is being archived. Please use the successor package [`ht-auth-repository`](https://github.com/headlines-toolkit/ht-auth-repository) instead.
+
 ## Overview
 
 This repository provides a standardized way to handle user authentication. It abstracts the underlying authentication client (`ht_authentication_client`) and provides a simple, consistent interface for interacting with authentication-related features.