Create ROADMAP.md for replication module production readiness

Author: makr-code

src/replication/ROADMAP.md

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+# Replication Module Production Readiness Roadmap
+
+## Overview
+The Replication Module is a key component of ThemisDB, providing systems with data replication capabilities. This roadmap outlines the phases, timelines, implementation details, and success criteria for achieving production readiness.
+
+## Phases
+
+### Phase 1: Requirements Gathering
+- **Timeline**: February 2026 - March 2026
+- **Details**: Collect input from stakeholders to define functional and non-functional requirements for the replication module.
+- **Success Criteria**: Documented requirements approved by all stakeholders.
+
+### Phase 2: Design
+- **Timeline**: April 2026 - May 2026
+- **Details**: Create architectural designs, flow diagrams, and interface designs. Utilize industry best practices to ensure scalability and reliability.
+- **Success Criteria**: Design documents reviewed and approved, including architectural diagrams.
+
+### Phase 3: Implementation
+- **Timeline**: June 2026 - November 2026
+- **Details**: Develop the replication module according to the approved design. Maintain code quality through regular code reviews and unit testing.
+- **Success Criteria**: All features implemented as per requirements with passing test cases (90% coverage).
+
+### Phase 4: Testing
+- **Timeline**: December 2026 - January 2027
+- **Details**: Conduct extensive testing, including unit tests, integration tests, and performance tests to validate functionality and performance under load.
+- **Success Criteria**: Documented test results showing performance thresholds met and no critical defects.
+
+### Phase 5: Deployment
+- **Timeline**: February 2027
+- **Details**: Prepare for production deployment. Create deployment scripts and rollback plans. Conduct staging environment tests.
+- **Success Criteria**: Successful deployment to staging; onboarding of monitoring and alerting systems.
+
+### Phase 6: Monitoring and Maintenance
+- **Timeline**: March 2027 onwards
+- **Details**: Implement monitoring tools for performance and error tracking. Establish a maintenance plan for regular updates and support.
+- **Success Criteria**: System monitored successfully with alerts configured for critical errors. Regular updates performed without significant downtime.
+
+## Conclusion
+This roadmap will guide the replication module from conceptualization to a fully operational state, ensuring that all requirements are met and that the system is robust, scalable, and maintainable. It serves as a living document and will be updated as needed throughout the project lifecycle.