settings endpoint and documentation

src/resources/application/applicationDocs.yml

src/resources/attendance/attendanceControllers.js

src/resources/attendance/attendanceRouter.js

src/resources/settings/__tests__/setingsFuncTest.js

src/resources/settings/__tests__/settingsPermTest.js

src/resources/settings/settingsControllers.js

src/resources/settings/settingsDocs.yml

src/resources/settings/settingsRouter.js

src/utils/testHelpers.js