Add helm install command

Author: liwenwu-amazon

README.md

@@ -82,12 +82,21 @@ eksctl create iamserviceaccount \
 --approve
 ```
 
-Step 4: deploy into cluster
+Step 4: Deploy into cluster using generated deploy.yaml
 
 ```
 kubectl apply -f deploy.yaml
 ```
 
+Step 4: Deploy using helm Chart
+
+```
+helm install(or upgrade) gateway-api-controller \
+oci://public.ecr.aws/aws-application-networking-k8s/aws-gateway-controller-chart\
+ --version=v0.0.2 \
+ --set=aws.region=us-west-2 --set=serviceAccount.create=false --namespace system
+```
+
 
 You can find more details are in  [Detail Notes](https://code.amazon.com/packages/MercuryK8SController/blobs/mainline/--/developer.md) and [end-to-end Smoke Test](https://quip-amazon.com/FaquAsssAitb/Testing-Manual-end-to-end-Smoke-Testing-for-Kubernetes-Controllers).