docs: document code quality (BerriAI#7149)

* docs: document code quality

* build(readme.md): cleanup

README.md

@@ -349,6 +349,20 @@ This covers:
 - ✅ **Custom SLAs**
 - ✅ **Secure access with Single Sign-On**
 
+# Code Quality / Linting
+
+LiteLLM follows the [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html).
+
+We run: 
+- Ruff for [formatting and linting checks](https://github.com/BerriAI/litellm/blob/e19bb55e3b4c6a858b6e364302ebbf6633a51de5/.circleci/config.yml#L320)
+- Mypy + Pyright for typing [1](https://github.com/BerriAI/litellm/blob/e19bb55e3b4c6a858b6e364302ebbf6633a51de5/.circleci/config.yml#L90), [2](https://github.com/BerriAI/litellm/blob/e19bb55e3b4c6a858b6e364302ebbf6633a51de5/.pre-commit-config.yaml#L4)
+- Black for [formatting](https://github.com/BerriAI/litellm/blob/e19bb55e3b4c6a858b6e364302ebbf6633a51de5/.circleci/config.yml#L79)
+- isort for [import sorting](https://github.com/BerriAI/litellm/blob/e19bb55e3b4c6a858b6e364302ebbf6633a51de5/.pre-commit-config.yaml#L10)
+
+
+If you have suggestions on how to improve the code quality feel free to open an issue or a PR.
+
+
 # Support / talk with founders
 
 - [Schedule Demo 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)