Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -5,3 +5,8 @@ Thank you for investing your time in contributing to our project! Any contributi
 Read our [Code of Conduct](./CODE_OF_CONDUCT.md) to keep our community approachable and respectable.
 
 Please open an Discussion or Issue before doing and PR, in PR please mark the Issue that is solving, feel free to contact me on twitter @cirospaciari or on my e-mail ciro.spaciari@gmail.com
+
+Code Rules
+> Use `black`as formatter in default configurations.
+> Try follow https://peps.python.org/pep-0008/ code rules.
+> This will be updated soon when the first refactor happens 🚀 ✨