importing library in visual studio code

let's say I want to use util4, I will write down in my java file:

import unit4.turtleLib.Turtle;

(I got the jar file in the same folder)
I'm running it over visual studio code without maven
(if I would want to install maven I would use a different IDE instead)
and I can't just put the jar file in the same folder it doesn't work that way, what should I do than?.