Add support for Google products (Gemini CLI and Antigravity code editor)

[Xilonz]

This PR introduces support for the Gemini CLI and the Antigravity code editor.

Changes

• Added support for Gemini CLI.
• Added support for Antigravity code editor.

Discussion:
I noticed that Gemini skills can also be distributed as an extension (see reference below). I am not sure if that is within the scope of this current project/repo, but I wanted to flag it for discussion.

References:

• Extension example: https://github.com/Xilonz/gemini-wordpress-agent-skills
• Gemini Extension: https://geminicli.com/docs/extensions/
• Gemini CLI Skills: https://geminicli.com/docs/cli/skills/
• Antigravity Skills: https://antigravity.google/docs/skills

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