Add emergency contact entity

[RaduCStefanescu]

As an user I can add to my profile a list of emergency contacts.
An emergency contact will not be visible outside the user profile.
The contacts will be defined as follows:

• Name Surname
• email address
• telephone number

This is linked to #16

[alecstincu]

I'll pick this up

[alecstincu]

As I understood, a Person will have a list of Emergency Contacts. This mapping with Person entity will be part of another task, right?

[georgebejan]

@alecstincu yes, since we don't have the Person entity yet