Chargers add rookie RB Branden Oliver

The Chargers, whose backfield depth is one of their strengths, have added to their numbers at tailback. The club has signed rookie running back Branden Oliver, an undrafted free agent from the University at Buffalo, the club said Wednesday. The 5-foot-8, 203-pound Oliver rushed for 4,049 yards and 33 touchdowns in four seasons at Buffalo,…