public void AddTema()
{
Console.Write("Id: ");
string id = Console.ReadLine();
Console.Write("Descriere: ");
string descriere = Console.ReadLine();
Console.Write("Deadline: ");
int deadline = Int32.Parse(Console.ReadLine());
Console.Write("Data primire: ");
int dateReceived = Int32.Parse(Console.ReadLine());
Service.AddTema(id, descriere, deadline, dateReceived);
}