data: add attributed vertebral keypoint subsets

.gitattributes

@@ -13,3 +13,4 @@ helmet_jacket/val.zip filter=lfs diff=lfs merge=lfs -text
 zhanglabdata_chest_xray/train.zip filter=lfs diff=lfs merge=lfs -text
 american_sign_language/test.zip filter=lfs diff=lfs merge=lfs -text
 american_sign_language/valid.zip filter=lfs diff=lfs merge=lfs -text
+vertebral_keypoints/v1/vertebral-keypoints-train-64.zip filter=lfs diff=lfs merge=lfs -text

vertebral_keypoints/v1/vertebral-keypoints-train-64.zip

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 1876621