Three years ago, Jennifer Holder and Shawanda Mason Moore had $100 and a dream of bringing people together across the city. They started The Chattery , a nonprofit that offers classes in practically any subject someone is willing to teach. (Recently, Sean Phipps gave a short course on how to smoke a pipe properly. Starting July 24, The Chattery will offer classes in "adulting." Other upcoming classes focus on subjects as diverse as astronomy, voting, and phonolgy.) The idea of The Chattery was