Add shelltime cc statusline integration to README

[AnnatarHe]

Add documentation for the shelltime cc statusline command that integrates with Claude Code's status bar feature, linking to the official docs and the detailed internal guide.

[gemini-code-assist]

Summary of Changes

Hello @AnnatarHe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the project's documentation by introducing a comprehensive guide for integrating shelltime with Claude Code's status bar. This new documentation empowers users to monitor real-time cost and context usage directly within their development environment, fostering better resource management and transparency.

Highlights

• New Documentation Section: A new section titled 'Claude Code Statusline Integration' has been added to the README.md file.
• Statusline Integration: The documentation details how to integrate the shelltime cc statusline command with Claude Code's status bar.
• Real-time Metrics: The integration allows for displaying real-time cost and context usage directly in the Claude Code status bar.
• Setup Instructions: Clear setup instructions, including a JSON snippet for Claude Code settings, are provided.
• Detailed Explanation: An example of the status line output is shown, along with a table explaining each metric displayed (Model, Session cost, Today's cost, Context usage).
• External and Internal Links: The documentation includes links to the official Claude Code status bar documentation and a more detailed internal guide (docs/CC_STATUSLINE.md).

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✅ All modified and coverable lines are covered by tests.

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[gemini-code-assist]

Code Review

This pull request adds a new section to the README.md file to document the Claude Code statusline integration. The documentation is clear and provides a good overview for users. I have one suggestion to improve the clarity of the setup instructions to prevent users from accidentally overwriting their settings file.

[gemini-code-assist]

To prevent users from accidentally overwriting their existing Claude Code configuration, it's better to be more explicit in the setup instructions. The current phrasing "Add to..." could be misinterpreted as replacing the entire file. I suggest rephrasing to clarify that the statusLine key should be added or updated within their existing settings.json file.

Suggested change

	Add to your Claude Code settings (`~/.claude/settings.json`):
	In your Claude Code settings file (`~/.claude/settings.json`), add or update the `statusLine` key: