Update README.md

Author: BaseMax

README.md

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 This repository provides a simple implementation of user authentication for Liveblocks using JavaScript. Liveblocks is a platform that enables real-time collaborative experiences in web applications. This example demonstrates how to authenticate users and manage access to rooms.
 
+![Liveblocks JavaScript Authentication](https://github.com/user-attachments/assets/57221258-05c2-44b6-a07b-724c060b7197)
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 ## Features
 
 - Generate unique user IDs for session management.