feat: allow the use of yamlfix as a pre-commit hook

Closes #10

.pre-commit-hooks.yaml

@@ -0,0 +1,10 @@
+---
+- id: yamlfix
+  name: yamlfix
+  entry: yamlfix
+  require_serial: true
+  language: python
+  language_version: python3
+  types_or: [cython, pyi, python]
+  args: []
+  minimum_pre_commit_version: 2.9.0

docs/editor_integration.md

@@ -1,5 +1,5 @@
-For a smother experience, you can run `yamlfix` each time you save your file
-in your editor.
+For a smoother experience, you can run `yamlfix` automatically each time each
+time you save your file in your editor or when you run `git commit`.
 
 # Vim
 
@@ -12,3 +12,21 @@ plugin](https://github.com/dense-analysis/ale).
     post](https://lyz-code.github.io/blue-book/linux/vim/vim_plugins/#ale).
 
 `ale` is configured to run `yamlfix` automatically by default.
+
+# [pre-commit](https://pre-commit.com/)
+
+You can run `yamlfix` before we do a commit using the
+[pre-commit](https://pre-commit.com/) framework. If you don't know how to use
+it, follow [these
+guidelines](https://lyz-code.github.io/blue-book/devops/ci/#configuring-pre-commit).
+
+You'll need to add the following lines to your project's
+`.pre-commit-config.yaml` file.
+
+```yaml
+repos:
+  - repo: https://github.com/lyz-code/yamlfix/
+    rev: master
+    hooks:
+      - id: yamlfix
+```