Add Poland 🇵🇱

[RVA2869]

Checklist

Please ensure the following before submitting the PR:

• I have tested the changes locally, and they work as expected.
• The code follows the project's coding standards and conventions.
• I have updated relevant documentation (if needed).
• I have added unit tests or performed manual testing where necessary.

[Ainali]

This looks good all over! Thanks for putting it together!