SHELL

git lfs

## Change .psd to the file extension which you want to track ##

git lfs install
git lfs track "*.psd" 
git add .gitattributes

## Done!, now just do git add ##

git lfs

Git Large File Storage (LFS) replaces large files such as audio samples,
videos, datasets, and graphics with text pointers inside Git, 
while storing the file contents on a remote server like GitHub.com 
or GitHub Enterprise.

Homebrew: brew install git-lfs
MacPorts: port install git-lfs