[Docs] Add example usage cases

[Wangmerlyn]

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[gemini-code-assist]

Summary of Changes

Hello @Wangmerlyn, 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 aims to significantly enhance the keep-gpu project's documentation by providing detailed usage examples. It clarifies how to use the keep-gpu tool both from the command line and programmatically via its Python API, making it easier for users to understand and integrate the library into their workflows.

Highlights

• Documentation Enhancement: Expanded the README.md to include more comprehensive usage examples for the keep-gpu library.
• CLI Usage Examples: Added a dedicated sub-section demonstrating how to use keep-gpu as a command-line tool.
• API Usage Examples: Introduced new examples showcasing the programmatic use of the CudaGPUController for managing GPU occupation, including non-blocking and context manager patterns.

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[gemini-code-assist]

Code Review

This pull request adds usage examples for both the CLI and the Python API to the README.md. The new documentation is well-structured and improves usability. However, the Python API examples contain incorrect import paths and a wrong method name, which would prevent them from running correctly. I've provided suggestions to fix these issues.