Add initial hello.py entry point

[Copilot]

The repository had no code — only a README, LICENSE, and .gitignore. This adds a minimal Python entry point as a starting point for the project.

Changes

• hello.py — prints a Chinese welcome greeting; structured with a main() function and __name__ guard per Python conventions

def main():
    print("你好！欢迎使用 intern_ai 项目！")

if __name__ == '__main__':
    main()

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