Hi,

Most mothers with PCOS are able to feed their babies just fine. More often than not, it is the usual stuff ups surrounding birth and early feeding that result in problems, rather than the PCOS. Some mothers with PCOS actually find it causes oversupply.
Preparation is you best ally. Go to an ABA breastfeeding class. In some areas they have special twin ones, - but otherwise the normal ones are great.
Keep your babies with you skin to skin as much as possible. Twin babies can also have the problem of being premature. If your babies are born prem, or near term (but not term) and are unable to effectively suckle, stimulate your milk supply as early as possible with a good electric breastpump (your hospital should have one, and you can hire them from ABA)
Get your support networks sorted out. Having twins is a lot of work - however you feed them.
Let us know how you go, and if you want to know anything else, just ask.