added section in README regarding easy install via conda
added section in README regarding easy install via conda

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