public async Task <Friend> CreateAsync(Friend friend)
        {
            _db.Friends.Add(friend);
            await _db.SaveChangesAsync();

            return(friend);
        }
        public async Task <Game> CreateAsync(Game game)
        {
            _db.Games.Add(game);
            await _db.SaveChangesAsync();

            return(game);
        }
        public async Task <Result <Rental> > CreateRental(Rental rental)
        {
            var result = new Result <Rental>();

            _db.Rentals.Add(rental);
            await _db.SaveChangesAsync();

            result.Success      = true;
            result.ResultObject = rental;

            return(result);
        }