Link to openai-func-enums (64bit#89)

Author: frankfralick

async-openai/README.md

@@ -105,6 +105,9 @@ Thank you for your time to contribute and improve the project, I'd be happy to h
 
 A good starting point would be existing [open issues](https://github.com/64bit/async-openai/issues).
 
+## Complimentary Crates:
+- [openai-func-enums](https://github.com/frankfralick/openai-func-enums) provides procedural macros that make it easier to use this library with OpenAI API's function calling feature. It also provides derive macros you can add to existing [clap](https://github.com/clap-rs/clap) application subcommands for natural language use of command line tools.
+
 ## License
 
 This project is licensed under [MIT license](https://github.com/64bit/async-openai/blob/main/LICENSE).