public void Add(Person person)
{
Console.WriteLine($"[{person.Name} came to work]");
foreach (var pers in _persons)
{
person.WalkedAway += pers.SayBye;
pers.WalkedAway += person.SayBye;
person.Came += pers.SayHi;
}
person.OnCome();
_persons.Add(person);
}