Add pre-commit hook

Author: CloCkWeRX

CONTRIBUTING.md

@@ -4,3 +4,11 @@ Please see the documentation on [contributing and developing for Snipe-IT](https
 
 
 Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
+
+### Useful tools
+
+Add codespell as a linter:
+`pip install codespell`
+
+Add a precommit hook:
+`cp contrib/hooks/pre-commit .git/hooks/`