Add requirements.txt file

[aklin2]

Issue Overview

Downloading the requirements (pandas, numpy, etc.) is a hassle and a bit unclear.
It would be easier if all the library requirements were in a single file, i.e. a requirements.txt file.
So that you can run this command:
pip install -r requirements.txt

Possible Solution

I attached requirements.txt that you can use.
The contents are:

pandas
matplotlib
seaborn
scikit-learn
numpy
xgboost
notebook

I recommend doing these steps:

1. Navigate to your copy of the repo.
2. Download the requirements.txt file and place it in your copy of the repo or create your own doing this:

echo "pandas
matplotlib
seaborn
scikit-learn
numpy
xgboost
notebook" > requirements.txt

3. Create a python virtual environment
   python3 -m venv ve
4. Activate the python virtual environment
   source ./ve/bin/activate
5. pip install requirements.txt
   pip install -r requirements.txt
6. Test by running any notebook
7. Done! 😄

You will also need to update the README.md to include these instructions, otherwise, I could do it if given permissions.