add demo

Author: Meriem-BenIsmail

README.md

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 This project demonstrates a **proof of concept** for using a custom JupyterLab plugin to connect to a **remote Jupyter server's kernel manager** using a shared token. It shows how one JupyterLab frontend (Server B) can start and interact with kernels running on another backend Jupyter server (Server A).
 
+![Demo](demo.gif)
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 ## 🧩 What This Demo Does