Related to mrpowers-io#173

Add maintainers to `pyproject.toml` file

* Add a `maintainers` section below the `authors` section.
* Include the names and contact information of the maintainers (first version only).
* Use the format `name <email>` for each maintainer.
* Add a comment above the `maintainers` section to indicate its purpose.

* Describe how to add ruff in IDEs like VSCode & PyCharm

Following changes have been made in the file(s):
* **CONTRIBUTING.md**
  - Remove mention of Black
  - Add instructions on how to add ruff to VSCode
  - Add instructions on how to add ruff to PyCharm