Submodule with the DualTone_Settings class
To add this module in your theme, move to the theme folder and execute the following command:
git submodule add git@github.com:dballari/dualtone-settings.git inc/settings
Then go to your functions file, include the settings class file and instantiate the class.
You will also need to add the DualTone_theme class, and instantiate it.
git submodule add git@github.com:dballari/dualtone-theme.git inc/theme
And example of this is provided in the tt5clone-meetup-mataro repository.