Add CONTRIBUTING.md

[simonedevit]

Add CONTRIBUTING.md file to provide clear guidance for developers and collaborators who want to help improve the project.

• How to Contribute:

  • Submitting bug reports or feature requests (e.g., via GitHub Issues).
  • Guidelines for proposing changes (e.g., pull requests).

• How to Get Started:

  • Setting up the development environment.
  • Build and symlink the project.
  • Running tests.

• Coding Standards:

  • Code style, formatting, or tools (like linting or Prettier).
  • Naming conventions for files or functions.

• Workflow:

  • Steps to fork, clone, branch, commit, and push.
  • Best practices for creating pull requests (e.g., "keep them small and focused").

• Etiquette:

  • Behavior guidelines (e.g., follow the project's Code of Conduct).
  • Communication tips for opening issues or discussing features.

[simonedevit]

Added CONTRIBUTING.md and CODE_OF_CONDUCT.md.