Add --df, --dots-first option to sort dot-files and dot-folders first

[dm17ryk]

Description

Thanks for contributing this Pull Request. Add a brief description of what this Pull Request does. Do tag the relevant issue(s) and PR(s) below. If required, add some screenshot(s) to support your changes.

• Relevant Issues : (none)
• Relevant PRs : (none)
• Type of change :
  • [x] New feature
  • [ ] Bug fix for existing feature
  • [x] Code quality improvement
  • [ ] Addition or Improvement of tests
  • [ ] Addition or Improvement of documentation

[dm17ryk]

looks good