pep8 compliance

[SBFRF]

make this repo pep8 compliant. this means updating function names to be underscore instead of camel case. adjust repo accordingly.

[SBFRF]

create good documentation for the whole repository.

[SBFRF]

Completed as part of the snake_case rename work:

• Phase 3 (PR Rename camelCase methods to snake_case with deprecation warnings (Phase 3+4) #61): Renamed all public methods from camelCase to snake_case
• Phase 4 (PR Rename camelCase methods to snake_case with deprecation warnings (Phase 3+4) #61): Added deprecation warnings for backward compatibility
• Phase 5 (PR Update dependent code and examples to use snake_case names (Phase 5) #62): Updated all internal code and examples

All function/method names now follow PEP8 snake_case convention. Old camelCase names still work but emit DeprecationWarning.