Update ingress-controllers.md

add Apache APISIX ingress controller

content/en/docs/concepts/services-networking/ingress-controllers.md

@@ -26,6 +26,7 @@ Kubernetes as a project supports and maintains [AWS](https://github.com/kubernet
 * [AKS Application Gateway Ingress Controller](https://azure.github.io/application-gateway-kubernetes-ingress/) is an ingress controller that configures the [Azure Application Gateway](https://docs.microsoft.com/azure/application-gateway/overview).
 * [Ambassador](https://www.getambassador.io/) API Gateway is an [Envoy](https://www.envoyproxy.io)-based ingress
   controller.
+* [Apache APISIX ingress controller](https://github.com/apache/apisix-ingress-controller) is an [Apache APISIX](https://github.com/apache/apisix)-based ingress controller.
 * The [Citrix ingress controller](https://github.com/citrix/citrix-k8s-ingress-controller#readme) works with
   Citrix Application Delivery Controller.
 * [Contour](https://projectcontour.io/) is an [Envoy](https://www.envoyproxy.io/) based ingress controller.