You should have received an email with the details of the suspension. Also, here's an article on account terminations and what you can do to appeal: https://goo.gl/myLLyA
and I wouldn't even bother with that worthless appeal, I did mine and a bot responded with the most generic response possible and after that you can't even defend yourself for their mess up. This is a really messed up system right now and youtube needs to do something about it