Offer a pre-commit Hook

[Kurt-von-Laven]

The pre-commit framework offers a convenient way to run tools authored in many languages as Git hooks (that are trivially also run in CI). It significantly reduces the friction involved in running code health checks written in a different language than the one your team is using so that any project can use the best tool available for a given task. LicenseFinder would make a spectacular hook since it beautifully abstracts away a complex, tedious task of near-universal relevance, supports many languages, and is natural for teams that don't have Ruby installed to wish to run.

[cf-gitbot]

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The labels on this github issue will be updated when the story is started.