- Renamed section "Set Up Your Environment" to "Generate Session String" and moved it up in the order.
- Added detailed instructions for generating a session string using Telethon's StringSession.
- Updated the environment setup instructions to include the new session string variable.
- Updated .env.example with new Telegram API credentials and session string options.
- Expanded .gitignore to exclude session files and configuration.
- Refactored main.py to support string session authentication and added new functions for contact and message management.
- Updated README.md to reflect new features, installation instructions, and usage examples.
- Added python-dotenv as a dependency in pyproject.toml for environment variable management.
