How to add a new Add-on Category


I would like to add a new ktuberling category in apps add on to be able to provide new playground for ktuberling (M. Patate in french)
I created halloween template ( and would like to extend ktuberling program with knewstuff usage.
But now i struggle to create this category ( egg-chicken problem ? )

I don’t have answer but it look like is the way to go
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