[FR] Implement "add" and "search" methods for PhoneBookInterface

[dRaider-bitrek]

Description

Implement "add" and "search" methods for PhoneBookInterface.
Implement methods in SimplePhoneBook:
public ContactDto add(ContactDto contactDto);
public List search(String str);

Dependencies

• [FR] Implement basic CLI support #16
• [FR] Create an interface ContactDtoRepository #18
• [FR] Create an implementation of the interface ContactDtoRepository #20
• Clear concept of a CLI #1
• [CR] Separate CLI command classes #35

Acceptance criteria

1. The methods should work according to Clear concept of a CLI #1

[DenysBurduzhan]

По проекту: сделал возможность поиска по имени, телефону и почте