public class Player
{
    public string name {get; set;}
    public int age {get; set;}
    public double salary {get; set;}
    public string gender {get; set;}
    public DateTime contractSignDate {get; set;}
}

public class Team
{
    public string teamName {get; set;}
    public string sportPlayed {get; set;}
    public List<Player> players {get; set;}
}