Add examples of using Client/Concept API in combination

[sorsaffari]

Document all the use cases for information retrieval using the Client/Concept API.

At the moment, all we have to serve showcase the Client/Concept API are the quickstarts in the individual client pages. They're very basic and don't uncover the full power of the APIs.

Perhaps, we should have a series of well-crafted examples that showcase every use case our users may come across when they work with these two APIs.