Update README.md

Author: ocommowi

README.md

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 # Anima scripts public data
 
 Data for running all scripts in [Anima scripts](http://github.com/Inria-Visages/Anima-Scripts-Public). Clone it as usual and see Anima scripts documentation for how to use them.
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+This repository uses [Git LFS](https://git-lfs.github.com) to handle files. It should be installed on your system before cloning.