docs(documents): 기여가이드 작성

[kusuri12-09]

Summary

• 기여 가이드라인을 위한 CONTRIBUTING.md 문서를 작성하였습니다.

Related Issue

• Closes #

Change Type

• New documentation
• Update existing documentation
• Fix incorrect/outdated content

Review Focus

• 빼먹은 부분은 없는지, 수정하거나 보충해야 할 부분이 있는지 확인해주세요.

Checklist

• Content is accurate
• Terminology is consistent
• Links / references verified

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