In their ceaseless search to add depth behind their starting rotation, the Nationals today signed 6-foot-10 right-hander Chris Young to a minor league deal with an invitation to big-league camp. Young, 33, made 20 starts for the New York Mets last year after returning from the shoulder operation he underwent in 2011. He went 4-9 with a 4.15 ERA in 115 innings, striking out 6.3 batters per nine innings while walking 2.8. An all-star in 2007, Young has since been besieged with shoulder issues. He made only four starts in both 2010 and 2011 and has thrown more than 100 innings twice in the past five years. Last year, though, Young showed improvement as he moved away from his latest operation. In his final eight starts, he punched up a 3.09 ERA with 38 strikeouts and 16 walks in 46 2/3 innings. His average fastball rose in his 20 starts, starting with 83.9 miles per hour in early June and finishing at 85.6 in his final game of the year.