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Introduced a comprehensive roadmap in `ROADMAP.md` to outline the vision, purpose, and development phases of the `DocumentOperator` service. Key additions include: - Table of contents for navigation. - Project overview with problem statement, solution, and core features. - Business workflow description for API operations. - Architecture and design decisions: - Clean Architecture principles and dependency rules. - CQRS with MediatR and Vertical Slice Architecture. - Exception-based error handling and Minimal APIs. - Multi-tenancy strategy using API keys. - Technology stack and detailed project structure. - Development roadmap with nine phases, highlighting current progress (Phase 1 completed, Phase 2 in progress). - Learning notes, references, and an update log. The roadmap serves as a living document to guide development and ensure alignment on goals and strategies.