docs: add progressive delivery with gitops example for openshift (argoproj#2400)

Signed-off-by: iam-veeramalla <abhishek.veeramalla@gmail.com>

Signed-off-by: iam-veeramalla <abhishek.veeramalla@gmail.com>

Author: iam-veeramalla

README.md

@@ -74,5 +74,6 @@ You can reach the Argo Rollouts community and developers via the following chann
 * [Gradual Code Releases Using an In-House Kubernetes Canary Controller on top of Argo Rollouts](https://doordash.engineering/2021/04/14/gradual-code-releases-using-an-in-house-kubernetes-canary-controller/)
 * [How Scalable is Argo-Rollouts: A Cloud Operator’s Perspective](https://www.youtube.com/watch?v=rCEhxJ2NSTI)
 * [Minimize Impact in Kubernetes Using Argo Rollouts](https://medium.com/@arielsimhon/minimize-impact-in-kubernetes-using-argo-rollouts-992fb9519969)
+* [Progressive Application Delivery with GitOps on Red Hat OpenShift](https://www.youtube.com/watch?v=DfeL7cdTx4c)