public void AddRow(IEnumerable<Tile> tiles)
        {
            var row = new RowOfTiles();

            foreach (var tile in tiles)
            {
                row.AddTile(tile);
            }

            rows.Add(row);
        }
        public void AddRepeatedRow(Tile tile, int count)
        {
            var row = new RowOfTiles();

            for (var i = 0; i < count; i++)
            {
               row.AddTile(tile);
            }

            rows.Add(row);
        }