Update manage_large_binaries_with_git_lfs.md
Add note to include .gitattributes file in repository - see instructions here: https://git-lfs.github.com/
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Add note to include .gitattributes file in repository - see instructions here: https://git-lfs.github.com/