How to Create a Gallery?

Can anyone point me to a “how to” on creating a gallery? I want to create a gallery extension and post it to the extensions library for LO. I’ve searched, but all I can find is the link below, which will not translate to English for me.

I used LO Draw a few years ago to make a set of all the common (western) music notation symbols. I’d like to compile these into a gallery extension to make them available for others to use. I’m not a programmer, so this would be a way for me to give back to the LO community.

https://wiki.documentfoundation.org/Extensions/How_to_create/fr

Do you know this Page? :

https://extensions.libreoffice.org/en/home/

Thank you Hrbrgr. That page will be helpful once I have the extension made and am ready to upload it. Right now, I’m trying to learn how to make a gallery and save it as an extention that can be uploaded.

Would you like to translate this page into English?

https://wiki.documentfoundation.org/Extensions/How_to_create/fr

Yes, I think that would give me the info I need.

I’ve tried to use the auto translate feature in my browser and I’ve tried to find the page in English, but neither has worked. If you know a way to translate it, or know of a different page, I would appreciate it very much.