Guide to import - setup and run simple Sikuli test

1. Download the Sikuli API JAR file into your Katalon project’s Drivers folder.  Sikuli can be found at this location:
   Libs: https://launchpad.net/sikuli/sikulix/2.0.4/+download/sikulixapi-2.0.4.jar

2. After that, imported the Sikuli classes you needed into the script:

import org.sikuli.script.Key
import org.sikuli.script.Screen
import org.sikuli.script.FindFailed
import org.sikuli.script.ImagePath

Using the ImagePath method, you can tell Sikuli where your images are (which I grabbed using the Windows Snipping tool):
ImagePath.add(System.getProperty("user.dir") + "\\Screenshots\\Sikuli");

And finally a few lines of code. For example:
Screen s = new Screen()
s.find( "Windows.png" )
s.click( "Windows.png" )