Update README.md

Author: NathanTarbert

README.md

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 # CopilotKit <> LangGraph AG-UI Canvas Starter
 
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+  [![Watch the video](https://img.youtube.com/vi/wTZUFelsneg/0.jpg)](https://www.youtube.com/watch?v=wTZUFelsneg)
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+  Watch the walkthrough video, click the image ⬆️
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+</div>
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 This is a starter template for building AI-powered canvas applications using [LangGraph](https://www.langchain.com/langgraph) and [CopilotKit](https://copilotkit.ai). It provides a modern Next.js application with an integrated LangGraph agent that manages a visual canvas of interactive cards with real-time AI synchronization.
 
-https://github.com/user-attachments/assets/2a4ec718-b83b-4968-9cbe-7c1fe082e958
 
 ## 🚀 Key Features