Sparkling lights, slot machines and a cardboard cutout of Elvis Presley greet people at the Little Vegas Wedding Chapel and Theater in ViaPort Rotterdam. It feels like you could be in Las Vegas and that’s the idea, said owner Bill McGrath. “People can do the Vegas experience right here in New York,” McGrath said. McGrath — who has been doing Elvis impersonations for 20 years– said many people had remarked that he looked like “The King of Rock ‘N’ Roll,” so he decided to take