Customer Microservice Strucutre & DTO & DDBB

Create package strucutre of microservice packages & CustomerDTO & DDBB (MongoDB)

PACKAGE:
- Controller
- Service
- Repository
- DTO
- Utilities
- Exceptions
- Documents / Entity
- Helpers

FIELDS OF "CustomerDTO":
Id => UUID
Name => String
DNI => String
Address => AddressDTO

FIELDS OF "AddressDTO":
Stret => String
City => String
Postal Code => int
Country => String

METHOD CHECK DNI:
Method to check correct DNI strucuture