Update ReadMe file's Demo section

[Hrishi5111998]

Please describe the desired behavior.
In the readme file under the demo topic their the GIF file that should be displayed. And that file is not working and that why empty space is being displayed there. Please update that file.

Additional context (optional)
Feel free to include any applicable: code, screenshots, or gifs.

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[Neilblaze]

@Hrishi5111998 changing your DNS server should fix the issue. Else, recheck your internet or explore if markdown images are loading properly or not from the GitHub's CDN i.e. https://raw.githubusercontent.com/...!