From Siamak: "Add docs for both service creators and service consumers on how to use service binding operator.

Existing docs:
https://github.com/redhat-developer/service-binding-operator/blob/master/docs/application-author.md

Notes

• The personas, use-cases and what each persona wants to achieve with the use-case should be define"

As mentioned in the comment below, some initial content exists here: https://github.com/redhat-developer/service-binding-operator/blob/master/docs/User_Guide.md
We need to structure (modularize) this content addressing two user stories as mentioned above: As a service creator how can I use service binding operator to create binding services and As a service consumer how can I use service binding operator to create binding services. (Need to find out if the consumer consumes or can also create binding services)