public override async Task <IEnumerable <Team> > GetAllAsync() =>
 await TeamsWithPlayers.ToListAsync();
 public override async Task <IEnumerable <Team> > GetAllAsync(Expression <Func <Team, bool> > condition) =>
 await TeamsWithPlayers.Where(condition).ToListAsync();
 public override async Task <Team> FindAsync(Expression <Func <Team, bool> > condition) =>
 await TeamsWithPlayers.SingleOrDefaultAsync(condition);