Americans are used to greeting pizza deliverymen at their doors, but a new smartphone app is bringing delivery into a new realm. The Drizly app for iPhone and Android devices enables consumers in certain markets to order from a large selection of beers, wines and spirits and have them delivered to their front doors in 20-40 minutes, according to Drizly Inc. Delivery drivers then authenticate and validate IDs using Drizly technology to ensure that consumers are of legal drinking age. The company adds that its products cost the same as they do in a local liquor store. Currently, Drizly services the major metropolitan areas of Boston, New York City and Brooklyn, N.Y., and recently added Chicago as its newest market.