A.B.
When they ask for a picture of you in electronic form, they just mean a digital picture of you. Take a picture with your camera, phone or tablet, download it to your computer. Get a new memory stick/flash drive, and download the file onto it. Your other option is to get a new SD card, take a picture with your camera and hand them the SD card to download the pic. The main thing is that you want it to be a new memory stick or new SD card because you don't want them to have access to all of your other files or pictures. You'll get it back and can use it after that...you just don't want them looking at all of yourstuff. Or, you could ask them if they would like for you to email them the picture. You could let them take a picture there, but I've found that those aren't always the most flattering. They may use your picture for your security badge, as part of a company directory or in an organizational announcement of you being hired. So, you want the picture to be something that you don't mind people seeing.
Congratulations on your new job!