By Sean Walsh Manchester United have signed promising 18-year-old midfielder Sekou Kone. The Mali youth international was courted by several of Europe’s top sides this summer, but picked United as his choice of club after leaving Guidars FC. The Red Devils wrapped up a deal for Kone on Friday evening, four hours before the closure of England’s transfer window. He was pictured with technical director Jason Wilcox at his unveiling. United’s short statement confirming the deal revealed how Kone will be given an extended period to adapt to life in England, detailing how he will be supported by the…