Add download badge for vidl.py to README

Author: hypernewbie

README.md

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 # Vidl - Simple IDL generator for C++
 
+[![Download vidl.py](https://img.shields.io/badge/Download-vidl.py-blue?style=for-the-badge&logo=python)](https://raw.githubusercontent.com/hypernewbie/vidl/refs/heads/main/vidl.py)
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 Vidl is a lightweight Python script that parses C++ header files for `// VIDL_GENERATE` comments and generates corresponding C++ structs and a command handler. It is useful for creating type-safe command buffers or RPC mechanisms.
 
 > NOTE: Vidl is vide coded, without too much code oversight. Intended as a throwaway tool of sorts. Use at your own risk.