Add README

Author: gjbex

source-code/symbolic-regression/README.md

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+# Regressno
+
+This directory contains material on regression, specifically symbolic
+regression, but also a comparison with random forest regression.
+
+
+## What is it?
+
+1. `data.txt`: data to use in the experiment.
+1. `create_data.py`: Python script to generate the data.
+1. `regression.ipynb`: Jupyter notebook that compares symbolic and
+   random forest regression.