Update README.md

README.md

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 ## 0. Brief Intro ##
 * segmentation of abdominal aorta from a CT scan
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 ![header](imgs/aorta_seg.gif)
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 > The segmentation process is implemented following this work: [Abdominal Aortic Aneurysm Segmentation
 with a Small Number of Training Subjects](https://arxiv.org/pdf/1804.02943.pdf)
 
 * 3D abdominal aorta shape and the center line recovered from one 2D X-ray image
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 ![header](imgs/demo-recover.gif)
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 * How it looks like when a catheter move through the recovered center line of aorta
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 ![header](imgs/demo-visual.gif)
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