(Reuters) - Starbucks Corp (SBUX.O), which sells the coffee that helps many Americans get wound up for their day, is now offering some a way to wind down. The company plans to begin selling beer and wine in a small number of cafes in Atlanta and Southern California by the end of this year as it explores an expansion beyond morning coffee and afternoon pick-me-ups. Starbucks is planning to add the alcoholic drinks and food such as savory snacks, cheese plates and hot flatbreads to menus in four to six outlets in each market.