docs: README에 MVP 문서 진입점 정리

[ohhalim]

작업 내용

• 루트 README.md 추가
• CoinFlow MVP의 목적과 구현 범위 정리
• MVP 제외 범위와 다음 단계 기능 구분
• 로컬 실행 방법 및 테스트 실행 방법 정리
• 주요 설계 문서 링크 추가
  • PRD
  • Plan
  • API
  • ERD
  • TestPlan
  • ORDER_FLOW
  • ISSUES
  • Reference
• 주문 생성부터 체결/정산/오더북 반영까지의 흐름을 .docs/ORDER_FLOW.md로 문서화
  closes [chore]: README에 MVP 문서 진입점 정리 #28

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Configuration used: defaults

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Run ID: 5cd261b0-ea8b-4267-9024-aa3db0618900

📥 Commits

Reviewing files that changed from the base of the PR and between 23cd73a and deb206a.

📒 Files selected for processing (2)

• .docs/ORDER_FLOW.md
• README.md

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch chore/28/readme-mvp-docs

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