docs: add GEMINI.md mirroring CLAUDE.md

[nuthalapativarun]

Summary

Adds GEMINI.md at the repo root with the same content as CLAUDE.md, directing Gemini CLI agents to follow AGENTS.md when contributing.

Closes #778

Checklist

• Changeset file added (.changeset/add-gemini-md.md, patch bump)
• No code changes — documentation only

[changeset-bot]

🦋 Changeset detected

Latest commit: 138b30c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@googleworkspace/cli	Patch

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[gemini-code-assist]

Summary of Changes

Hello, 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 introduces a new documentation file, GEMINI.md, which mirrors the existing CLAUDE.md file. The primary objective is to ensure that Gemini CLI agents are properly directed to follow the repository's established contribution guidelines defined in AGENTS.md, maintaining consistency across different AI-assisted development tools.

Highlights

• Documentation Update: Added GEMINI.md to the repository root to mirror CLAUDE.md, ensuring Gemini CLI agents follow established contribution guidelines.
• Changeset Inclusion: Added a new changeset file to track the documentation update and trigger a patch version bump.

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[gemini-code-assist]

Code Review

This pull request adds a GEMINI.md file instructing contributors to follow the guidelines in AGENTS.md, and includes a corresponding changeset file. There are no review comments, and I have no feedback to provide.