Symmetria

FEATURE:

- `symmetria.Permutation`: add `is_conjugate` method
- `symmetria.Cycle`: add `is_conjugate` method
- `symmetria.CyclePermutation`: add `is_conjugate` method

FEATURE:

- `symmetria.Permutation`: add `sgn` method
- `symmetria.Cycle`: add `sgn` method
- `symmetria.CyclePermutation`: add `sgn` method
- `symmetria.Permutation`: add `inverse` method
- `symmetria.Cycle`: add `inverse` method
- `symmetria.CyclePermutation`: add `inverse` method
- `symmetria.Permutation`: add `is_even` and `is_odd` methods
- `symmetria.Cycle`: add `is_even` and `is_odd` methods
- `symmetria.CyclePermutation`: add `is_even` and `is_odd` methods
- `symmetria.Permutation`: add `cycle_type` method
- `symmetria.Cycle`: add `cycle_type` method
- `symmetria.CyclePermutation`: add `cycle_type` method

MAINTENANCE:

- `tests.tests_meta.test_order.py`: add test suite for order of methods
- `docs._static.symmetria.png`: logo for symmetria
- `.github.workflows.tests`: add doctest

MAINTENANCE:

- `.github`: add workflows `tests.yml`, `code-style.yml`, `release.yml` and `check-pr-title.yml`
- `.github.pull_request_template.md`: add pull request template
- `.github.ISSUE_TEMPLATE`: add templates for issues
- `tests`: in module tests we import as in the API
- `.pre-commit-config.yml`: add `check-toml` and `name-tests-test`
- `docs`: first version of the docs implemented

🎉🚀 First version of `symmetria` 🚀🎉