Added linux installation guide to README.md
Added linux installation guide to README.md

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