Update README.md

README.md

 ![GOKU API Gateway](https://data.eolinker.com/course/6HlFXxbc2833947dbfa6840bbba348714dfbe33018fd6cc "GOKU API Gateway")
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 Goku API Gateway is a Golang-based microservice gateway that enables high-performance dynamic routing, multi-tenancy management, API access control, etc. It's also suitable for API management under micro-service system.