chore: add pre-commit help in CONTRIBUTING

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CONTRIBUTING.md

+# Contribute to funkwhale/ansible
+
+Check out the [Funkwhale contributing guide](https://dev.funkwhale.audio/funkwhale/funkwhale/-/blob/develop/CONTRIBUTING.md) for information about how to contribute to the Funkwhale project.
+
+## Development environment
+
+### Pre-commit
+
+The [`pre-commit`](https://pre-commit.com/) tool is used to ensure that the files you commit are properly formatted, follow best practice, and don't contain syntax or spelling errors.
+
+You can install and setup pre-commit using the [quick-start guide on the pre-commit documentation](https://pre-commit.com/#quick-start). Make sure to [install pre-commit](https://pre-commit.com/#1-install-pre-commit) and [setup the git pre-commit hook](https://pre-commit.com/#3-install-the-git-hook-scripts) so pre-commit runs before you commit any changes to the repository.