That’s great! I see the license is GPL. In that case, it should indeed be mentioned on the official Duniter website.
I’m not a maintainer of the website, and I’m not even sure who is. I’ve only seen @HugoTrentesaux updating it lately.
If you want to help, you can create an issue or a merge request on the Duniter website repo: https://git.duniter.org/websites/duniter-website-en-v2