Update XIAO-Showdown-2025.md

[Ziegler András (AndrasZiegler)]

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
N/A

[github-actions]

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[Ziegler András (AndrasZiegler)]

Hello Tim Lovett (@Timo614)
Your previous PR was locked and i dont know why. I created now i new PR
Please sign again the CLA check .

[Tim Lovett (Timo614)]

I have read the CLA Document and I hereby sign the CLA behalf on myself, e-mail: timo614@gmail.com

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud