feat(mitarbeiter-erstellen): implement employee form functionality

src/app/service/employee.service.ts

@@ -23,6 +23,10 @@ export class EmployeeService {
     }
   }
 
+  createEmployee(employee: EmployeeResponseDTO) {
+
+  }
+
   updateEmployee(employee: EmployeeResponseDTO) {
     this.http.put(`${SkillService.BASE_URL}/employees/${employee.id}`, this.responseDtoToPutDto(employee)).subscribe();
   }