If you want to learn there is tons of tutorials on forum and outside, just Google lua tutorial, there is also xenobot.wikia with almost all commands needed so you should have no problem with thinking if there is command like this or not.
I gave general info so with minimum knowledge and with a bit of search done on forum you could easily write it by yourself. If there is scripter that wanted to help in this particular scenario, great.
This is not a nursery and even there you get help and guidance instead an answer.
