Burnley have confirmed that teenager Mark Helm has joined the club on a two-year contract after being released from Manchester United.Helm had spent 12 years at Man Utd, but failed to agree on the terms of a new contract after his latest contract expired at the end of June.The central midfielder reached the semi-finals of the FA Youth Cup with the Red Devils 2020 and played 24 matches in Premier League 2 last season.He now goes to Turf Moor to join Burnley's under-23 side, but hopes to break into the first team, citing…