Add docstrings to setup.py

Author: seisman

setup.py

@@ -1,3 +1,10 @@
+"""
+A simple setup.py script to support editable installs.
+"""
+# References:
+# - https://github.com/pypa/setuptools/issues/2816
+# - https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
+
 from setuptools import setup
 
 setup()