Build a telegraph (Morse key) with a Raspberry PI

Hi there, I wanted to build a morse key because i want to practice morse with it ! I have a 3d printer, a switch (10A, 250V), a Raspberry Pi 3B+ and some electronics. Do you have an idea on how I can connect it and collect the output, I don't know much about electronics. Thanks !

Here is the switch I would like to use