docs: add configuration instructions

[averikitsch]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @averikitsch, 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 documentation for configuring the AlloyDB Gemini CLI extension. It clarifies how users can set up necessary parameters, whether through interactive prompts during installation or manually, and introduces new CLI commands for managing these settings. The update aims to provide a smoother and more guided configuration experience for users, particularly distinguishing between data plane and admin toolset requirements.

Highlights

• Enhanced Configuration Instructions: The README.md now provides significantly more detailed and user-friendly instructions for configuring the AlloyDB extension, including how settings are prompted during installation and saved.
• Detailed Environment Variable List: A comprehensive list of ALLOYDB_POSTGRES_ environment variables, their purpose, and optionality (e.g., ALLOYDB_POSTGRES_PROJECT, ALLOYDB_POSTGRES_IP_TYPE) is now included in the documentation.
• CLI Configuration Management: New commands (gemini extensions list, gemini extensions config alloydb) are documented, enabling users to view and update extension settings directly via the Gemini CLI.
• Important Operational Notes: Crucial information regarding the necessity of Application Default Credentials and a reference to a troubleshooting section have been added to the documentation for better user guidance.

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[gemini-code-assist]

Code Review

This pull request significantly improves the configuration instructions in the README.md file. The new documentation is more detailed, explaining the interactive configuration process, how to manage settings, and providing the alternative of using environment variables. My review includes a few suggestions to further improve clarity and reduce redundancy.