Update README.md

Author: ThomasK33

README.md

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 A Neovim plugin that integrates with Claude Code CLI to provide a seamless AI coding experience in Neovim.
 
-https://github.com/coder/claudecode.nvim/assets/docs/demo.mp4
+https://github.com/user-attachments/assets/c625d855-5f32-4a1f-8757-1a3150e2786d
 
 ## Features