Instructions:
Stand at location of where you want the items to spawn and type /generators set (coal/iron/gold/diamond/netherite)

Repeat this command for each generator location.

Edit the Prefix and Generator Times in the OPTIONS: above this message

Done! Enjoy

Install:
Drag and drop "generators.sk" into your scripts folder
"plugins/skript/scripts"

You might also need these addons for it to work:
Skellett
SkQuery
SkRayFall
TuSKe

When you have everything installed. Either restart or do /sk reload generator in-game

Permissions:
OP to do the /generator command.