Set json example for rest endpoint

driver/src/main/java/cz/muni/pa165/driver/rest/DriverController.java

@@ -8,6 +8,7 @@ import cz.muni.pa165.common_library.dtos.DriverUpdateDto;
 import cz.muni.pa165.driver.service.CarService;
 import cz.muni.pa165.driver.service.DriverService;
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.Valid;
 import java.util.List;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -44,7 +45,15 @@ public class DriverController {
   @PostMapping(path = "/add", consumes = MediaType.APPLICATION_JSON_VALUE,
       produces = MediaType.APPLICATION_JSON_VALUE)
   public ResponseEntity<DriverResponseDto> addDriver(
-      @Valid @RequestBody DriverAddDto driverAddDto) {
+      @Valid
+      @RequestBody
+      @Schema(example = "{\"name\":\"Fernando\", " +
+          "\"surname\": \"Alonso\", " +
+          "\"nationality\": \"Spanish\", " +
+          "\"characteristics\" : {\"Experience\" : 1," +
+          "                               \"Aggressiveness\" : 1," +
+          "                               \"Consistency\" : 1," +
+          "                               \"Racecraft\" : 1 }}") DriverAddDto driverAddDto) {
     return ResponseEntity.ok(driverService.addDriver(driverAddDto));
   }