A Basic PlayGround to go around

- Delegation over inheritance design pattern
- With following Ideas:
  Agency 
    -> has_many: tour_guides
    -> has_many: translators
  TourGuide
    -> has_many: tourists
  Translator
    -> has_many: tourists

  A TourGuide can be Translator 
  A Tourist cannot be TourGuide/Translator.
  A Tourist can be assigned to TourGuide & Translator

Feature: Register a new user

As a visitor
So that I have access to the application
I want to register myself to be a new user

Feature: Login and logout as an existing user

As a registered user
So that I have access to the application
I want to login to my account

Feature: Edit personal details

As a tourist
So that my personal details are up-to-date
I would like to edit them

Feature: Self assigned to tourists

As a tour guide
I would like to assign myself to a tourist