Merge pull request kubernetes#3421 from dtw45/master

Add link to AWS IAM OIDC example in README.md

Author: k8s-ci-robot

cluster-autoscaler/cloudprovider/aws/README.md

@@ -48,6 +48,9 @@ by specifying Auto Scaling Group ARNs in the `Resource` list of the policy. More
 information can be found
 [here](https://docs.aws.amazon.com/autoscaling/latest/userguide/control-access-using-iam.html#policy-auto-scaling-resources).
 
+### Using OIDC Federated Authentication
+OIDC federated authentication allows your service to assume an IAM role and interact with AWS services without having to store credentials as environment variables. For an example of how to use AWS IAM OIDC with the Cluster Autoscaler please see [here](CA_with_AWS_IAM_OIDC.md).
+
 ### Using AWS Credentials
 
 **NOTE** The following is not recommended for Kubernetes clusters running on