Needs examples of how to list information

[moritz]

The README.md shows an example of how to manipulate information through the client, but not how to obtain information.

For example, how do I get list of slb.virtual_server? Can I filter them? How do I get from virtual_server to service_group, and from there to the server objects in that group?

(There is a general need for more documentation, but having more examples would be a great start)