[JavaAdvent] Simulation controller example for the POST method

SimulationController.java

@PostMapping("/")
@ResponseStatus(HttpStatus.CREATED)
public ResponseEntity<Simulation> newSimulation(@Valid @RequestBody SimulationDto simulation) {
    checkForRestriction(simulation.getCpf());

    Simulation createdSimulation = repository.save(new ModelMapper().map(simulation, Simulation.class));
    URI location = ServletUriComponentsBuilder.fromCurrentRequest().path("/{cpf}").
       buildAndExpand(createdSimulation.getCpf()).toUri();

    return ResponseEntity.created(location).build();
}