Take Jo Pelkey, the Pittsfield greeting card manufacturer. Add a group of women interested in ecology and recycling paper. What do you get? Rapping Paper, that's what. What's that? It's a new recycled stationery product called "Rapping Paper," and it is going on the market next week in a nationwide campaign. Rapping Paper has a number of firsts going for it, according to Pelkey, president of Editions Limited on Columbus Avenue.