Add pre-commit hook that watches for large files

Will need to pull in the git python project from https://github.com/gitpython-developers/GitPython.git in order to get files in the index.

added git-hooks label

mentioned in commit bf92dc74

mentioned in merge request !10 (merged)

mentioned in commit 53c43101

closed via merge request !10 (merged)

mentioned in commit dc5927c0

mentioned in commit fffd256c