Add Storybook example for <SRStatus>

The component <SRStatus> has currently no examples attached to it in the Storybook. Since the component's usage only applies for screen readers and isn't visible we, of course, can't show an actual viewable example but the documentation should still be available within Storybook.

To get a better overview of the available components in stripes-components we need to add missing storybook stories/examples.

This will make it easier for us to adjust styles and add/update functionality in the future.

Lastly, it will give other developers a better overview of which components they have at their disposal.