Add screenshot to README

Added visual preview image to showcase the Live Stream Manager interface.

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Co-Authored-By: Claude <noreply@anthropic.com>

README.md

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 A professional [Next.js](https://nextjs.org) web application for managing live streams and controlling multiple OBS [Source Switchers](https://obsproject.com/forum/resources/source-switcher.941/) with real-time WebSocket integration and modern glass morphism UI.
 
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+![alt text](image.png)
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 ## Features
 
 - **Multi-Screen Source Control**: Manage 7 different screen positions (large, left, right, and 4 corners)