Added setup.py to README's project organization (#236)

Co-authored-by: bnamaral <[email protected]>

README.md

@@ -63,6 +63,7 @@ The directory structure of your new project looks like this:
 ├── requirements.txt   <- The requirements file for reproducing the analysis environment, e.g.
 │                         generated with `pip freeze > requirements.txt`
 │
+├── setup.py           <- makes project pip installable (pip install -e .) so src can be imported
 ├── src                <- Source code for use in this project.
 │   ├── __init__.py    <- Makes src a Python module
 │   │