Add comprehensive contributing, testing, roadmap, and database schema documentation for DMARQ

docs/changelog.md

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+# Changelog
+
+All notable changes to DMARQ will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2025-04-15
+
+### Added
+- Initial release of DMARQ
+- Domain management with basic health checks
+- DMARC report processing (aggregate and forensic)
+- Dashboard with compliance rate visualization
+- IMAP integration for automatic report collection
+- User authentication and management
+- SQLite and PostgreSQL database support
+- Docker deployment option
+- Basic alert system for compliance issues
+- API for third-party integration
+- Documentation site
+
+### Security
+- Secure password storage with bcrypt
+- JWT-based authentication for API
+- Rate limiting for API endpoints
+- Input validation for all user inputs
+
+## [0.9.0] - 2025-03-01
+
+### Added
+- Beta release for early testing
+- All core functionality implemented
+- Limited to SQLite database only
+
+### Fixed
+- Multiple parser bugs for different report formats
+- UI responsiveness issues on mobile devices
+
+## [0.8.0] - 2025-02-15
+
+### Added
+- Alpha release for internal testing
+- Basic DMARC report parsing
+- Simple domain management
+- Initial dashboard design
+
+### Known Issues
+- Limited support for forensic reports
+- Missing authentication features
+- No alerting capabilities