README: add stance on AI contributions

Author: Technologicat

README.md

@@ -6,6 +6,8 @@ In the spirit of [toolz](https://github.com/pytoolz/toolz), we provide missing f
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+For my stance on AI contributions, see the [collaboration guidelines](https://github.com/Technologicat/substrate-independent/blob/main/collaboration.md).
+
 We use [semantic versioning](https://semver.org/).
 
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