docs: update settings.md with comprehensive steps

[KJ7LNW]

This PR updates the settings documentation to include all necessary steps for adding a new configuration item, including schema definitions, type definitions, and critical steps for persistence and UI display.

This ensures the documentation accurately reflects the complete process required when adding new settings to the application.

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Important

Updates settings.md to provide comprehensive steps for adding new configuration items, covering schema definitions, type definitions, persistence, and UI display.

• Documentation:
  • Updates settings.md to include steps for adding new configuration items.
  • Details schema definitions in schemas/index.ts and type definitions in exports/types.ts, exports/roo-code.d.ts, shared/ExtensionMessage.ts, and shared/WebviewMessage.ts.
  • Specifies test coverage requirements in ClineProvider.test.ts.
• UI and Persistence:
  • Describes adding settings to ExtensionStateContext.tsx, ClineProvider.ts, and SettingsView.tsx.
  • Emphasizes critical steps for persistence and UI display, such as vscode.postMessage calls in SettingsView.tsx.

^{This description was created by for 7ec5fac. It will automatically update as commits are pushed.}

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Latest commit: b18e809

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[adamhill]

Thanks!