Add docstring to Keyword data class

[Lang-Qiu]

Problem

The Keyword data class in the kugou module is a public component but lacks documentation, which negatively impacts code readability and maintainability. Clear documentation is essential for developers to understand the purpose and structure of this class.

Changes

• Added a Kotlin docstring to the Keyword class, describing its role as a data class that holds keyword information including title and artist fields.
• The documentation follows Kotlin conventions and does not alter any existing code structure or functionality.

Verification

• Review the added docstring to ensure it accurately reflects the class's purpose and fields.
• Since this is a documentation-only change, no functional tests are required; however, existing tests can be run to confirm no regressions were introduced. The change is minimal and backward-compatible.

[codesandbox]

Review or Edit in CodeSandbox

Open the branch in Web Editor • VS Code • Insiders

Open Preview

[RajnishKMehta]

Given that Keyword is a simple two-field data class, I'm not sure the added documentation provides much additional value.

Additionally, the new docstring appears to be written in Chinese. Most code comments and documentation in the project are written in English, so it would be preferable to keep this docstring in English for consistency.