docs: add python binding docstrings

[kazdy]

Description

resolves: #70

google style docstrings: https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html

How are the changes test-covered

• [x] N/A
• [ ] Automated tests (unit and/or integration tests)
• [ ] Manual tests
  • [ ] Details are described below