Adding servers and wwwroot folder to test websites

Adding dependencies and commands for iis, web listener and khestrel to each
site (including our samples)

Each website comes with a readme.md to 'anchor' the otherwise empty
folder. We have another work item tracking adding content to these.

Once VS sees a project with a wwwroot, it wants to assign a port for iis,
so I let it.
In theory none of our functional tests should require `StaticFiles`. That said this looks like it was automated, so we'll live with it.