Added documentation on MIX+GAN
Added documentation on MIX+GAN

deepchem/deepchem,deepchem/deepchem,miaecle/deepchem,ktaneishi/deepchem,Agent007/deepchem,miaecle/deepchem,lilleswing/deepchem,lilleswing/deepchem,ktaneishi/deepchem,miaecle/deepchem,ktaneishi/deepchem,Agent007/deepchem,Agent007/deepchem,peastman/deepchem,peastman/deepchem,lilleswing/deepchem