Update README.md

README.md

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 This is a modified version of [data](https://figshare.com/s/37ec464af8e81ae6ebbf) for the paper: 
 [Fully Automatic System for Accurate Localisation and Analysis of Cephalometric Landmarks in Lateral Cephalograms](https://doi.org/10.1038/srep33581)
 
+- 400 head and neck X-ray scans and 19 landmarks for each image
 - We saved the original 2D `.bmp` images into pseudo 3D `.nii.gz` files in a manner that the original
   2D sagittal slices can be extracted from the 3D NIfTI files correctly assuming the standard RAS+
   orientation of `.nii.gz` files. A pseudo voxel size [0.1, 0.1, 0.1] is set in the NIfTI header,