How can I use a generic repository and unitofwork?

I have a service layer which is using unitofwork and Imapper, example given below:

//Service layer
public interface IEmployeeService
{
Task AddEmployee(EmployeeListResponseModel model);
}
public class EmployeeService : IEmployeeService
{
public async Task AddEmployees(EmployeeListResponseModel mode)
{
public EmployeeService (IUnitOfWork unitOfWork, IMapper mapper)
{
_unitOfWork = unitOfWork;
_mapper = mapper;
}
private readonly IUnitOfWork _unitOfWork;
private readonly IMapper _mapper;
}

Question: How can i call this service method "AddEmployees" in one of my class library project? For creating a object of class "EmployeeService" i need to create unitofwork and imapper but i do not know the best practice. Kindly help