Closes #22

Python-guidelines.md

+Python guidelines
+=================
+
+About code style and which tools to use to automatically test style and/or fix
+it.
+
+- [PEP 8 -- Style Guide for Python Code](https://www.python.org/dev/peps/pep-0008/)
+- [PEP 257 -- Docstring Conventions](https://www.python.org/dev/peps/pep-0257/)
+- [PEP 287 -- reStructuredText Docstring Format](https://www.python.org/dev/peps/pep-0287/)
+
+Tools to check and/or fix style
+-------------------------------
+
+- [editorconfig](https://editorconfig.org/): helps maintain consistent coding
+  styles for multiple   developers working on the same project across various
+  editors and IDEs.
+- [Black](https://black.readthedocs.io/en/stable/):
+  mostly follows PEP8, automatic formatter, smallest diffs possible.
+- [flake8](https://flake8.pycqa.org/en/latest/): mostly follows PEP8, linter.
+- [flake8-docstring](https://pypi.org/project/flake8-docstrings/): 
+  follows PEP257.
+- [isort](https://pycqa.github.io/isort/): sort imports alphabetically and 
+  automatically separated into sections and by type.
+
+Other tools: https://realpython.com/python-code-quality/
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