Document X (Twitter) integration in README
- Add X Developer account setup instructions
- Include X OAuth 1.0a configuration example
- Document X testing commands and rate limits
- Update key features to highlight cross-platform operation
- Add X-specific troubleshooting guidance
void now operates on both Bluesky AND X\! 🚀
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>