add uswds files

src/main/resources/swagger/uswds/css/uswds.min.css

...ds/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2

...fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2

src/main/resources/swagger/uswds/img/icon-dot-gov.svg

src/main/resources/swagger/uswds/img/icon-https.svg

src/main/resources/swagger/uswds/img/us_flag_small.png

...ain/resources/swagger/uswds/img/usa-icons/expand_less.svg

...ain/resources/swagger/uswds/img/usa-icons/expand_more.svg

src/main/resources/swagger/uswds/img/usa-icons/warning.svg

src/main/resources/swagger/uswds/js/uswds-init.min.js

src/main/resources/swagger/uswds/js/uswds-init.min.js.map

src/main/resources/swagger/uswds/js/uswds.min.js

src/main/resources/swagger/uswds/js/uswds.min.js.map