Revert "remove unnecessary module"

This reverts commit 1d10ab13a1afa180df706ab98fad2acb3d6a18e4.
Revert "add sample post-commit files"

This reverts commit 8af280f78c27a7d423d1e0cdfce799dceef59175.
Revert "add sample post-commit file"

This reverts commit 1f9370fb206d82aae28f728b8f11440fbe9880e7.