add credits

Author: emuell

generate/README.md

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 This is a rust app that generates the API definition chapters in the [Renoise XRNX book](https://renoise.github.io/xrnx/) from the [Renoise API definition](https://github.com/renoise/definitions) files.
 
+It is based on [matt-allan's](https://github.com/matt-allan) [mdbook-luacat](https://github.com/matt-allan/mdbook-luacats)  tool.
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 ## Building 
 
 ### Requirements