Add CLAUDE.md for repository guidance

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Repository state
+
+This repository is currently empty of source code. It contains only a `README.md`
+with a short note (in Korean) describing it as a personal storage space
+("자비스공간안에 여러가지 자료들을 보관할꺼야" — "I'll keep various materials in this Jarvis space").
+
+There is no build system, package manifest, test suite, linter configuration,
+or directory structure to document yet. Do not invent commands, frameworks, or
+architecture for this repository — check the actual repository contents first,
+since they may have changed since this file was written.
+
+## Working here
+
+- Since there is no established structure or convention yet, the first
+  substantial contribution to this repo should establish one deliberately
+  (e.g., a package manifest, directory layout, README updates) rather than
+  accumulating files ad hoc.
+- Once real code, tooling, or documentation is added, update this file with
+  the actual build/lint/test commands and a high-level description of the
+  architecture — don't leave this placeholder in place once it's stale.