Reducto

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- fix __init__.py package description updated.

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- Doc updates
- README reference to top_pypi_source_code_stats.
- Spelling errors corrected on .rst docs.

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- Doc updates.
- README: Badge for readthedocs.
- README: Corrected direction to ReadTheDocs site.
- docs/command_line_interface.rst: added -p/--percentage.
- docs/index.rst: added examples of the different options.

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Initial release.

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- Add noxfile.py
- Update typing to pass mypy checks

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- Argument as percentage added.
- Method ``reducto.reducto.Reducto_add_argument_as_percentage``
- Method ``reducto.reports.PackageReport._report_grouped``
- Method ``reducto.reports.SourceReport._as_dict``