0.4.0 MVP 2

HU covered in this release (0.4.0):
         -[x] HU1 Add bank account as customer user
         -[x] HU4 Delete bank account as customer user 
         -[x] HU16 Erase Account 
         -[x] HU14 Create user
         -[x] HU2 Add bank-card as customer user
         -[x] HU5 Delete bank card as customer user




Hi, controller was created OK {
  "users": {}
}
We had added a user in system: {
  "users": {
    "999f7f66abf88ee70243988": {
      "id": "999f7f66abf88ee70243988",
      "email": "[email protected]",
      "created_at": "2020-07-08T22:18:00",
      "bank_accounts": {},
      "bank_cards": {}
    }
  }
}
We delete now this user from system
Now our customer users are: {
  "users": {}
} 
Adding Card to User:
Now Card is added to user {
  "id": "999f7f66abf88ee70243988",
  "email": "[email protected]",
  "created_at": "2020-07-08T22:18:00",
  "bank_accounts": {},
  "bank_cards": {
    "507f1f77bcf86cd799439011": {
      "id": "507f1f77bcf86cd799439011",
      "number": "5555111122223333",
      "cvc": "584",
      "date_limit": "2022-07-08T22:18:00",
      "status": true
    }
  }
}
Removing Card from User:
Now Card is removed from user {
  "id": "999f7f66abf88ee70243988",
  "email": "[email protected]",
  "created_at": "2020-07-08T22:18:00",
  "bank_accounts": {},
  "bank_cards": {}
}