Beautiful bird! They are closely related to chickens, so you could get some chicken feed at the local farm store if you would like to feed it. They roost in trees. If he's limping, it might be difficult for him to roost.

Those things don't just roam wild on this continent normally, so someone lost their peacock. Is there a ranch or stable or estate around that he might have come from? I bet there's a peacock rescue organization out there (google!) that could give you information on what to do and might even be able to help.