Revert "removing LFS"

This reverts commit e9ebbf66a27b7b61355cfbe3f1a4dce9ed8e4caf.

README.md

 **Note**: this project demos multiple features that are still in Preview, meaning they introduce brand new features and workflows. As such, some of these features may be subject to change (API, UX, scope, etc.) and aren’t covered by traditional Unity support. 
 You can, however, report issues with Preview features on our [forum](https://forum.unity.com/forums/graphics-experimental-previews.110/?_ga=2.75910933.1446511377.1522795261-1647295365.1509665782) page.
 
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 Acknowledgement
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.gitattributes

+*.fbx filter=lfs diff=lfs merge=lfs -text
+*.tif filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
+*.maya filter=lfs diff=lfs merge=lfs -text
+*.exr filter=lfs diff=lfs merge=lfs -text
+*.ma filter=lfs diff=lfs merge=lfs -text
+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.tga filter=lfs diff=lfs merge=lfs -text
+*.bmp filter=lfs diff=lfs merge=lfs -text
+*.spm filter=lfs diff=lfs merge=lfs -text