How to properly add add python script to autostart

[vol.rom]

Hello I'm using Retroflag NESPi Case for my Raspberry Pi.

I tried to add this script but without success: https://github.com/RetroFlag/retroflag-p...hutdown.py
I deleted os.system("sudo killall emulationstation") and tried to run it but I failed to do so.

Any ideas how to set it properly?

Thanks,
Volodymyr