This commit introduces a Ruby gem that provides text obfuscation functionality
with support for both English and Russian languages.

Key features:
- Preserves text structure (punctuation, spacing, capitalization)
- Maintains word lengths (unless naturalization is enabled)
- Supports multiple obfuscation modes
- Optional text naturalization according to some basic rules
- Irreversible transformation
- Deterministic output with seeds
- Full UTF-8 support
- Comprehensive error handling with specific error types

Technical details:
- Modern Ruby 3.3+ syntax
- Modular architecture with separate naturalization logic
- Comprehensive test coverage
- Bilingual documentation