Nigerian novelist, Chimamanda Adichie has revealed that she once had a crush on Ghanaian football star Michael Essien.    The revelation was made in the introduction she wrote for a picture book, Africa? The Future of Football, which is authored by a photographer Pall Stefansson.   Recalling how Nigeria was absent at a football tournament she watched in her introduction titled “Football Nationalism”, Adichie said she became “Ghanaian” after the Ghanaian football team caught her attention.    She wrote;    “I watched …