19 - When I create a Pull Request, I want to see if the code is written properly

## Objectives 🎯
- [x] Configure GitHub Actions using a `.github/workflows/linting.yaml` file
- [x] Assure feedback is shown in Pull Requests

## Prerequisites 🎒
- Continuous Integration

## References 📚
- [Command Line Interface - ESLint](https://eslint.org/docs/2.13.1/user-guide/command-line-interface)

## Tips 💡
- Test the linting locally before pushing code