add example images for numpy section
Added an example image (electron microscopy) and nucleus segmentation for the numpy section. (all images from here: https://www.biorxiv.org/content/10.1101/2020.02.26.961037v1)
Added an example image (electron microscopy) and nucleus segmentation for the numpy section. (all images from here: https://www.biorxiv.org/content/10.1101/2020.02.26.961037v1)