how to enable git lfs in github code example

Example: git enable lfs

# Make sure to install the git lfs command line extension first.

# After installing the extension (if you haven't), enable it in your repo:
git lfs install
# You only need to run this once per user account.

# Use LFS for a file type (do this in your repo dir)
git lfs track "*.psd"

# Make sure to track this in your repo!
git add .gitattributes