Add directory structure to README, improves #10
Add directory structure to README, improves #10

The file structure is an essential part of the provided benefit and should be in the readme file.
ScottSnapperLab/cookiecutter-data-science,mnarayan/cookiecutter-data-science,grenzi/cookiecutter-data-science,ScottSnapperLab/cookiecutter-data-science,drivendata/cookiecutter-data-science,drivendata/cookiecutter-data-science,ScottSnapperLab/cookiecutter-data-science