With all apple devices and android devices it is important to have your contacts saved in your gmail account. If you have done that prior to losing them on your iPad you simply need to associate your iPad to your gmail account. Go to settings, mail contacts and calendars , then enter your gmail info. This should import your contacts. Then make sure you save them to your iCloud that way they will be saved forever. Look me up if you need any more help as I currently use iOS and android but lf you need more iOS specific questions answered there is an apple forum online as well that functions the same as AF, very easy to use and people more than willing to help you out.