Create empty grid cell

Grid.cs

    private void Start()
    {
        Assert.IsNotNull(gridCellPrefab);

        for (var y = 0; y < height; ++y)
        {
            for (var x = 0; x < width; ++x)
            {
                var cellPosition = new Vector3(x, y, 0);
                var createdInstance = GameObject.Instantiate(gridCellPrefab, cellPosition, Quaternion.identity);

                createdInstance.name = $"Grid Cell [{x}, {y}]";
                createdInstance.transform.SetParent(transform);
            }
        }
    }