Option for creating "application" components

[dlockhart]

Some ways this could differ from "labs" or "official" component types:

• Repo could default to Brightspace (but maybe ask?)
• Name in package.json shouldn't be prefixed with @brightspace-ui or @brightspace-ui-labs but instead d2l- to match other application components
• Initial folder structure
• Stretch: The initial component that we provide could be a bit more "application-like", possibly with a couple of sub-views. Once we have a router it could use that.

[jorge-ramirez-arredondo]

The name could also be prefixed with d2l- since that seems to be the standard for applications. And having a slightly differently worded initial README would be nice.

As for the stretch, even if we don't have the router ready yet, just having a basic page component and initial folder structure to get people started would be good.