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public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        
        let numberOfColumns : CGFloat = 2
        let width = collectionView.frame.size.width
        let xInsects : CGFloat = 10
        let cellSpacing : CGFloat = 5
    

        return CGSize(width: (width / numberOfColumns) - (xInsects + cellSpacing),  height: (width / numberOfColumns) - (xInsects + cellSpacing))
}