docs: add GitHub Wiki link to documentation section

Author: KikuAI-lab

reliapi/README.md

@@ -158,6 +158,7 @@ docker run -d -p 8000:8000 \
 ```
 
 ## Documentation
+- [GitHub Wiki](https://github.com/KikuAI-Lab/reliapi/wiki) - Complete documentation and guides
 
 - [OpenAPI Spec](./openapi/openapi.yaml) - Complete API specification
 - [Postman Collection](./postman/collection.json) - Import into Postman for testing