Binder missing pandas, matplotlib, and seaborn install in Notebook 01

[Emmavt]

On binder, pandas, matplotlib, and seaborn are not installed, and so students needed to pip install them before running the first code cell. I'm not familiar with how binder backends works, but if it would be possible to either pre-install those packages or add an install cell in the notebook, that would be great.

[pssachdeva]

We will need a requirements.txt, probably