Update README.md with user attachments link

Added a link to user attachments in the README.

Author: seyeong-han

voxtral_realtime/windows/README.md

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 Real-time speech transcription desktop app powered by ExecuTorch with CUDA acceleration.
 
+https://github.com/user-attachments/assets/9288b923-24e6-4d73-9298-80b325633c2c
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 This is the Windows equivalent of the [macOS Voxtral Realtime app](../macos/).
 
 ## Quick Start