Merge pull request #7 from codefitz/codex/add-tests-directory-with-pytest-or-unittest

Merge pull request #6 from codefitz/codex/add-requirements.txt-and-update-readme

Merge pull request #5 from codefitz/codex/refactor-exception-handling-and-logic-simplification

Merge branch 'master' into codex/refactor-exception-handling-and-logic-simplification

Merge pull request #4 from codefitz/codex/refactor-checkips-and-output-functions

Merge branch 'master' into codex/refactor-checkips-and-output-functions

Merge pull request #3 from codefitz/codex/refactor-subnet-file-handling

Merge pull request #2 from codefitz/codex/modify-validate_subnet-for-cidrize-output

Merge pull request #1 from codefitz/codex/check-argument-input-in-ipcheck.py

Add basic pytest suite and docs

Add requirements file and update README

Improve exception handling and simplify logic

Refactor mapping logic to be passed explicitly

Load subnets file once

Handle multiple subnets from cidrize