docs: add image linked to video in README.md (#6084)

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```release-note
```
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BugKing 2024-06-19 15:54:57 +08:00 committed by GitHub
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@ -21,6 +21,8 @@
<a href="https://t.me/halo_dev">Telegram 频道</a>
</p>
[![Watch the video](https://www.halo.run/upload/halo-github-screenshot.png)](https://www.bilibili.com/video/BV15x4y1U7RU/?share_source=copy_web&vd_source=0ab6cf86ca512a363f04f18b86f55b86)
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