A trip to the supermarket — to shoplift — became a half-million-dollar windfall for a crook, thanks to a Brooklyn jury. Kevin Jarman sued the city for a broken ankle suffered while cops were arresting him at a Queens Pathmark in May 2011— even though he later pleaded guilty to the shoplifting. On Wednesday, a jury stunned even the admitted thief, awarding him a $510,000 verdict for the broken ankle. While it was the biggest, the windfall wasn’t Jarman’s first payout from the city. He sued the NYPD in 2005 for false arrest after a drug-sale rap was dropped.