Added D3-201 class instruction
Added D3-201 class instruction

DrSkippy/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,blehman/Data-Science-45min-Intros,subodhchhabra/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,subodhchhabra/Data-Science-45min-Intros,blehman/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,subodhchhabra/Data-Science-45min-Intros,subodhchhabra/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,subodhchhabra/Data-Science-45min-Intros,blehman/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,blehman/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,blehman/Data-Science-45min-Intros