A 20-year-old man was charged on Monday with shooting a 16-year-old teenage boy in West Philadelphia last week, District Attorney Larry Krasner announced. Taesean Grant, 20, was charged with two counts of aggravated assault, gun charges and other related offenses in the shooting. Grant admitted to police that he shot the 16-year-old after his arrest, Krasner said. The 16-year-old was shot in the back in a busy West Philly shopping corridor on 52nd Street near Market and Chestnut streets. One of the bullets fired in the shooting shattered a window at the Ajwa Islamic Fashion Store on 52nd Street….