Integrate dashboard setup

[eruvanos]

Is your feature request related to a problem? Please describe.
Service broker should always provide an instance specific dashboard, even if it is just a placeholder, because updating the url requires customers to trigger a service update, which requires additional maintenance.

To support this, an easy added dashboard with a placeholder should come by default.

Describe the solution you'd like
Provide a method to get dashboard url and provide a simple placeholder template, which just says, here will be more.

Describe alternatives you've considered
Developer have to do it by themselves.