Add README

Author: gjbex

source-code/polars/README.md

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+# Polars
+
+Polars is an alternative to pandas that is designed to have better performance.
+
+
+## What is it?
+
+1. `patient_data.ipynb`: Jupyter notebook that explores functional differences
+   between pandas and polars.  It replicates the notebook in the `pandas`
+   directory with the same name.
+1. `data`: Directory containing the data used in the notebook.