My iphone is showing me a computer and charger icon and it randomly shut down

It seems to me that the battery might be (close to) depleted. Do you see a battery icon in the top-right corner? Is it open (with a small red bit), filled, or partially filled?

Try connecting the iPhone to a computer USB port, or to a USB power adapter in an AC socket.

Charge the iPhone battery - Apple Support

What is the model iPhone? Identify your iPhone model - Apple Support

What is the version iOS on this iPhone? Find the software version on your iPhone - Apple Support

It’s in recovery mode. You need to restore ios using your computer.