Business domain extensability

[b-around]

Feature Request

Description of Problem:

The documentation is not clear on how to add new services and business domains (either BIAN or non-BIAN). Specifically, as a new user of the framework I'd like to have a clear set of steps and functionality around:

• how to tell the framework to pick a new YAML with a service interface for a domain not yet implemented (either BIAN or non-BIAN)
• how to tell the framework where to pick it from (either BIAN default repository or a different location)
• how to tell the framework whether the service gets deployed to an existing Project (domain) or to a new project
• how to tell the framework whether this new service should be exposed via HTTPS, gRPC or other
• how to tell the framework whether this new service does not need a kafka cluster, to make use of an existing cluster or deploy a new one (when deploying into existing projects, it is assumed that only one kafka cluster exists and in such cases, no additional cluster should be deployed)

Potential Solutions:

Where the above is already possible to do today, update the documentation to clarify how this can be done
Where the above is not available, consider making the functionality available