WDFN-270 - Create USGS-WDFN Visual ID package.
Created by: mbucknell
Initial commit of style sheets and javascript implementing the USGS visual identification standards. The USWDS are used as a basis. See https://github.com/mbucknell/waterdataui/tree/viz_id_experiment for a reference use of this package.
I added style sheet linting using stylelint, stylelint-scss, and stylelint-config-recommended-scss.
Also note that this is using version 5.0.0. of eslint