Update XIAO-Showdown-2025.md

[Timo614]

Description

This pull request adds my project from the Xiao Showdown to the list per the instructions. To avoid conflicts across other users adjusting this I've left the demo link element alone so it's an additive update vs one that removes elements from the page.

Related Issue

N/A

Changes Made

• Added my link for Xiao Showdown to the project list

Checklist

• I have read the Contributor License Agreement.
• I have followed the repository's coding guidelines .
• I have checked the action workflow results and they are all passed.

Screenshots (if applicable)

N/A

Additional Notes

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[Timo614]

I have read the CLA Document and I hereby sign the CLA behalf on myself, e-mail: [email protected]