Gufo-loader

Added

* `py.typed` file for PEP-561 compatibility
* docs: Supported standards
* Loader.__iter__() method.

Changed

* docs: license.md renamed to LICENSE.md

Infrastructure

* Adopt ruff
* Use `actions/checkoutv3`
* Use `actions/cachev3`
* Project structure tests
* CI workflows tests
* Extend licence copyright years
* Dockerfile: Use `set -x` to log RUN commands
* docs: Use common Gufo Labs mkdocs plugins set

Added

* Python 3.11 support
* Add CITATION.cff
* Developer's Common Tasks

Changed

* Move CHANGELOG.md to the project root

Infrastructure

* Use Python 3.11 for dev container
* Use mkdocs-material 3.5.8
* Use pytest 7.2.0
* Use python-coverage 6.5.0

Added

* `__version__` attribute.

Added

* Initial implementation.