Add AI Assistance section to README (#1936)

Added section on AI assistance and related policies.

Author: bobstrecansky

README.md

@@ -12,6 +12,8 @@ Please read the official documentation: https://opentelemetry.io/docs/instrument
 
 API Documentation is available here: https://open-telemetry.github.io/opentelemetry-php/
 
+## AI Assistance
+If you're planning on using AI to contribute to the OpenTelemetry PHP repositories, please follow the [OpenTelemetry GenAI Policies](https://github.com/open-telemetry/community/blob/main/policies/genai.md).
 ## Packages and versions
 
 | Package              | Latest                                                                                                                                                                                                                                                                                                                                                  |