docs: add playground section with screenshot to readme

[PENEKhun]

Changes

• changed readme (added playground section)

For Reviewer

you can see changed readme.md from here : https://github.com/do-pa/itdoc/tree/docs/readme-playground

Summary by CodeRabbit

• Documentation
  • Added a Playground section to the README describing an in-browser playground experience: includes the playground URL, notes that no local Node.js installation is required, warns initial load may take up to 2 minutes, and includes an embedded demo image illustrating the playground.

[coderabbitai]

Walkthrough

Adds a new "Playground" section to README.md describing an in-browser playground at https://itdoc.kr/playground, noting no Node.js installation is required, warning the initial load may take up to 2 minutes, and embedding a demo image. This is a documentation-only change with no code, build, or runtime behavior modifications.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Documentation-only change limited to README.md
• No code, tests, or configuration edits to review
• Files to inspect: README.md (verify text, URL, and embedded image link)

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "docs: add playground section with screenshot to readme" is fully related to and clearly summarizes the main change in the changeset. The raw summary confirms that the only modification is to README.md, where a new Playground section with an embedded screenshot has been added. The title accurately identifies the nature of the change (documentation addition), specifies the type of content being added (playground section with screenshot), and identifies the target file (readme). This title is specific, descriptive, and avoids vague terminology, making it clear to reviewers what the primary change involves.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/readme-playground

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between afbb6cf and e898c8d.

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🪛 markdownlint-cli2 (0.18.1)

README.md

37-37: Bare URL used

(MD034, no-bare-urls)

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b8075e4 and afbb6cf.

⛔ Files ignored due to path filters (1)

• itdoc-doc/static/img/playground-demo.gif is excluded by !**/*.gif

📒 Files selected for processing (1)

• README.md (1 hunks)

🧰 Additional context used

🪛 markdownlint-cli2 (0.18.1)

README.md

37-37: Bare URL used

(MD034, no-bare-urls)

🔇 Additional comments (1)

README.md (1)

34-43: Good addition to the README.

The new Playground section is well-placed and provides helpful context for users wanting to quickly explore itdoc without setup. The note about desktop browsers and initial load time sets realistic expectations. The embedded demo image will be a nice visual aid once the image file is verified to exist at the referenced path.

Please verify that the image file exists at itdoc-doc/static/img/playground-demo.gif relative to the repository root.

[wnghdcjfe]

LGTM