This file allows you to create a custom menu where players can see how to craft custom items you created.
It's pretty easy to be undertood, so as you can see, to create a category of this menu you need to copy an already existing one, for example the category0:
Then you can set one of your custom items/weapons/bows... as icon. You can set a name, and finally a list of the items you want to be shown in this category, for example now there's only the item0 shown in this category.
To show this menu use /ni