Added license to BNF.
Added license to BNF.

begray/intellij-haskforce,begray/intellij-haskforce,carymrobbins/intellij-haskforce,charleso/intellij-haskforce,charleso/intellij-haskforce,KasperJanssens/intellij-haskforce,KasperJanssens/intellij-haskforce,carymrobbins/intellij-haskforce,charleso/intellij-haskforce,begray/intellij-haskforce,carymrobbins/intellij-haskforce