Add the promised documentation

{{cookiecutter.project_slug}}/README.md

@@ -39,6 +39,10 @@ To automatically apply most suggested linting changes execute:
 ```tox -e format```
 
 The configuration for linting and tox can be found in `pyproject.toml`
+For further references on tox or pyproject.toml visit:
+
+1. https://tox.wiki/en/latest/config.html#pyproject-toml-ini
+2. https://packaging.python.org/en/latest/guides/writing-pyproject-toml/
 
 ## License
 This project is licensed under the Apache License Version 2.0