add ReactRouter to demo app and write some unit test ---------------------------------------------------- Key: SWSQE-22 URL: https://issues.jboss.org/browse/SWSQE-22 Project: Swift Sunshine QE Issue Type: Sub-task Reporter: viet nguyen Assignee: viet nguyen while waiting for swift-ui project to take shape we can write some unit tests against a simple react-router component Note: ReactRouter is used by swift-ui for navigation between pages. It is also used to pass data to UI components.