Document Happy Path for crAPI

[JBAhire]

Is your feature request related to a problem? Please describe.
Currently, when we start crAPI, we don't know where to click or where to look to generate specific vulnerabilities. We should document a "happy path" or principal workflow which will help people to actually understand the working of the crAPI application.

Describe the solution you'd like
A document with "happy path" and link it in main README.

Describe alternatives if any you've considered
NA

Additional context
NA

[chahat99]

Can you please assign it to me?