public CreateCourseCommandValidator()
{
RuleFor(x => x.Name).NotEmpty().Length(10, 30).WithMessage("Name validation failed");
RuleFor(x => x.Description).Length(10, 260).WithMessage("Description validation failed");
RuleFor(x => x.Languages).Must(x => x.All(l => SupportedLanguages.GetAll().Contains(l))).NotNull();
RuleFor(x => x.Avatar).NotNull();
}
