Release v0.4.1

New features:
Added two simple statistic functions

• get_hbr_character_frequency(s: &str) -> HashMap<String, usize>
• get_hbr_character_types(text: &str) -> HebrewCharacterTypes

CI:
Added two CI scripts for automatic testing (GitHub Actions).

• build & test
• clippy-analyze

Documentation:

• Updated README.md
• Added badges
• Added UNRELEASED.md