[Request] Simple addon to show a box if i have items in bags
 

Hello, would like some help, from someone that know how to make an addon,
i need an addon to display a little square, or a icon, if i have green boes ilvl 266 in bags, this is because im a multiboxer, and when im vendoring its hard to notice who still have green left.. so i would like to speed this process up

like show green square if i have green boes below ilvl 266. and a red square or no square at all if i dont have any