Implement backoffice crud backend

See merge request !8

# Conflicts:
#   backoffice/backoffice-api/pom.xml
#   backoffice/backoffice-api/src/main/java/dto/doctor/UpdateDoctorRequestDto.java
#   backoffice/backoffice-impl/pom.xml
#   backoffice/backoffice-impl/src/main/java/cz/muni/fi/pa165/medystem/backoffice/mapper/AppointmentMapper.java
#   backoffice/backoffice-impl/src/main/java/cz/muni/fi/pa165/medystem/backoffice/mapper/DoctorMapper.java
#   backoffice/backoffice-impl/src/main/java/cz/muni/fi/pa165/medystem/backoffice/mapper/MedicalRecordMapper.java
#   backoffice/backoffice-impl/src/main/java/cz/muni/fi/pa165/medystem/backoffice/mapper/PatientMapper.java
#   backoffice/backoffice-impl/src/main/java/cz/muni/fi/pa165/medystem/backoffice/service/validation/AppointmentValidation.java
#   backoffice/backoffice-impl/src/main/resources/application.properties

FEAT: Make all microservices dockerized

See merge request !9

Implement backoffice crud backend

See merge request !7

Implement pharmportal

See merge request !5

Implement User and Group service

See merge request !4

FIX: Exchange explicit ResponseEntity for implicit one, Add distinction for Request/Response in the name of DTOs

FEAT: Introduce global .gitingore file

See merge request !1