Create an example of MDCAppBarContainerViewController usage (#4197)
Create an example of MDCAppBarContainerViewController usage (#4197)


material-components/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,randallli/material-components-ios