docs: add instruction on how to use pre-commit

docs/developer_documentation/workflows/index.md

@@ -9,6 +9,7 @@ maxdepth: 1
 ---
 
 git
+pre-commit
 changelog
 release
 

docs/developer_documentation/workflows/pre-commit.md

@@ -0,0 +1,20 @@
+# Pre-commit
+
+Funkwhale uses [pre-commit](https://pre-commit.com/) 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 and setup the git pre-commit hook so pre-commit runs before you commit any changes to the repository.
+
+The workflow looks like this:
+
+1. Install `pre-commit`.
+2. After cloning the repository, setup the pre-commit git hooks:
+
+   ```sh
+   git clone git@dev.funkwhale.audio:funkwhale/funkwhale.git
+   cd funkwhale
+
+   pre-commit install
+   ```
+
+3. Make your changes and commit them.
+4. If `pre-commit` fails to validate your changes, the commit process stops. Fix any reported errors and try again.