5 addworkinghours error

[paonath]

Resolve issue #6

see test:

//code omitted
var wts1 = new WorkTimeSpan() { Start = new TimeSpan(08, 00, 0), End = new TimeSpan(12, 0, 0) };
var wts2 = new WorkTimeSpan() { Start = new TimeSpan(13, 30, 0), End = new TimeSpan(17, 30, 0) };
var wts  = new List<WorkTimeSpan>() { wts1, wts2 };

var italiansHoliDays = new List<AHolyDay>() { new EasterMonday() };
var week = new WeekDaySpan()
{
	WorkDays = new Dictionary<DayOfWeek, WorkDaySpan>()
	{
		{ DayOfWeek.Monday, new WorkDaySpan() { TimeSpans    = wts } },
		{ DayOfWeek.Tuesday, new WorkDaySpan() { TimeSpans   = wts } },
		{ DayOfWeek.Wednesday, new WorkDaySpan() { TimeSpans = wts } },
		{ DayOfWeek.Thursday, new WorkDaySpan() { TimeSpans  = wts } },
		{ DayOfWeek.Friday, new WorkDaySpan() { TimeSpans    = wts } },
		{ DayOfWeek.Saturday, new WorkDaySpan() { TimeSpans  = wts } }
	}
};
var utility  = new WorkingDaysAndTimeUtility(week, italiansHoliDays);

var dateTime = new DateTime(2023, 1, 18, 12, 30, 22);
var result = utility.AddWorkingHours(dateTime, 1);

Assert.Equal(new DateTime(2023,1,18,14,30,22), result);