Update README.md

Author: ahuang11

README.md

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 This extension for HoloViz Panel introduces a client-side interface for running large language models (LLMs) directly in the browser.
 
+![demo](https://github.com/user-attachments/assets/c72d0cb3-b72b-44e7-b134-f80d165bfa40)
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 It leverages WebLLM under the hood to provide an in-browser LLM execution environment, enabling fully client-side interactions without relying on server-side APIs.
 
 ## Features