Adding CNCF blog to readme file (argoproj#16893)

Signed-off-by: Chetan Deshmukh <cdeshmukh@infracloud.io>
Signed-off-by: Adrian Aneci <aneci@adobe.com>

README.md

@@ -86,4 +86,5 @@ Participation in the Argo CD project is governed by the [CNCF Code of Conduct](h
 1. [Getting Started with ArgoCD for GitOps Deployments](https://youtu.be/AvLuplh1skA)
 1. [Using Argo CD & Datree for Stable Kubernetes CI/CD Deployments](https://youtu.be/17894DTru2Y)
 1. [How to create Argo CD Applications Automatically using ApplicationSet? "Automation of GitOps"](https://amralaayassen.medium.com/how-to-create-argocd-applications-automatically-using-applicationset-automation-of-the-gitops-59455eaf4f72)
+1. [Progressive Delivery with Service Mesh – Argo Rollouts with Istio](https://www.cncf.io/blog/2022/12/16/progressive-delivery-with-service-mesh-argo-rollouts-with-istio/)