Explaining Temporary Voluntary or Medical Leave from Prestigious PhD on CV?
I recommend you list your PhD studies on your CV. Industry is full of people who have left a PhD program for one reason or another! It's also unlikely anyone will look down on you for your poor grades in one semester.

There are two issues I would give some thought to: (1) how will you describe your reasons for leaving the programme (temporarily), and (2) will you tell them about your intention to return to the PhD programme. It's best if you can describe (1) in a way that won't give potential employers concern that you might not be able to handle the job. Being honest about (2) may discourage some employers from hiring you if they want a long-term employee, but others may be willing to gamble that you'll change your mind and stick around.