Added example for SeqToSeq fingerprint
Added example for SeqToSeq fingerprint

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