chore: add MuAPI powered-by badge

Author: Anil-matcha

README.md

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 # 🎭 Generative Media Skills for AI Agents
 
+[![Powered by MuAPI](https://img.shields.io/badge/Powered%20by-MuAPI-6366f1?style=flat-square&logo=data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCI+PHBhdGggZmlsbD0id2hpdGUiIGQ9Ik0xMiAyQzYuNDggMiAyIDYuNDggMiAxMnM0LjQ4IDEwIDEwIDEwIDEwLTQuNDggMTAtMTBTMTcuNTIgMiAxMiAyem0tMSAxNHYtNGgtMnYtMmg0djZoLTJ6bTAtOFY2aDJ2MmgtMnoiLz48L3N2Zz4=)](https://muapi.ai?utm_source=github&utm_medium=badge&utm_campaign=generative-media-skills)
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 **The Ultimate Multimodal Toolset for Claude Code, Cursor, Gemini CLI, and OpenCode.**
 A high-performance, schema-driven architecture for AI agents to generate, edit, and display professional-grade images, videos, and audio — powered by the [muapi-cli](https://github.com/SamurAIGPT/muapi-cli).