docs: 기본 파일 구조, .gitignore, CLAUDE.md, README.md, 및 작업 관리 시스템을 위한 설정 파일 추가

.claude/commands/task/expand.md

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+---
+allowed-tools: mcp__taskmaster-ai__expand_task, mcp__taskmaster-ai__expand_all
+description: Break down tasks into subtasks
+---
+
+# Expand Tasks
+
+**User Request:** $ARGUMENTS
+
+## Goal
+
+Break complex tasks into manageable subtasks.
+
+## What You Can Say
+
+```
+/expand 5                        # Break down task 5
+/expand 5 security focus         # With specific context
+/expand all                      # Expand all pending tasks
+/expand 5 research               # Use research for better breakdown
+```