Update README.md

Author: Avalin

README.md

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+Search keywords: Unity CI/CD, Unity GitHub Actions, Unity automation pipeline, Unity build system, Unity deploy GitHub, Unity test automation, Unity game dev CI.
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 # 🚀 Unity CI/CD Pipeline
 
 **Robust GitHub Actions workflows for Unity projects. Automates testing, multi-platform builds, and GitHub Releases with modular, reusable design.**