docs: add skillkit as recommended multi-agent installation option
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This PR adds SkillKit as a recommended installation option for installing skills across multiple AI coding agents.
SkillKit is a universal skills loader that supports 17+ AI coding agents including Claude Code, Cursor, Codex, Gemini CLI, Windsurf, Goose, Amp, GitHub Copilot, and more.
npx skillkit install ComposioHQ/awesome-claude-skills
npx skillkit install ComposioHQ/awesome-claude-skills --agent cursor --agent claude-code --agent windsurf
Addresses: https://github.com/ComposioHQ/awesome-claude-skills/issues/69