KARA SHEA JONSSON Richard Bradford co-stars in “The OK Trenton Project,” which he also co-wrote. It was meant to be an educational summer camp project: The creation of a piece of public art, to be displayed in Trenton. And it ended up teaching the 17 kids who took part in it more about the world than anyone could have imagined. The sculpture, titled “Helping Hands” — a giant hand made out of pots and pan, giving the “okay” sign — was taken down four days after being installed in 2017, after some complaints that it could be interpreted as a gang symbol. “The Ok Trenton Project” — a play about t…