* Added support of:
* `pytest`
* `flake8`
* Implemented:
* `simputils.config.base` utils
* `simputils.config.components.ConfigHub` static class
* `simputils.config.components.handlers.DotEnvFileHandler` DotEnv support
* `simputils.config.components.handlers.JsonFileHandler` JSON support
* `simputils.config.components.handlers.YamlFileHandler` YAML support
* `simputils.config.enums.ConfigStoreType` enum for config source types
* Different exception types in `simputils.config.exceptions`
* `simputils.config.generic.BasicFileHandler` to create custom file-handlers
* `simputils.config.models.AppliedConf` model to store history of the applied configs
* `simputils.config.models.ConfigStore` model to store config (foundation code of the library)
* Almost full test-coverage
* Added some documentation:
* [README.md](../README.md)
* [docs/overall-example.md](overall-example.md)
* [docs/working-with-config-store.md](working-with-config-store.md)
* Added `docs/overall-example.md` documentation