Updating Rekognition examples

javascript/example_code/rekognition/estimate-age-example/src/README.md

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+# Amazon Rekognition Detect Faces example
+Amazon Rekognition makes it easy to add image and video analysis to your applications using  AWS SDK for JavaScript version 2 (v2).
+
+This example demonstrates how to estimate the ages of faces in an photo.
+
+# Running the example
+
+1. Open the AWS CloudFormation Console, choose the stack, and choose the  **Resources** tab. 
+
+2. Copy the **Physical ID** of the **CognitoDefaultUnauthenticatedRole**.
+
+3. In the *estimate-age.html* file, replace **IDENTITY_POOL_ID** with the **Physical ID** of the **CognitoDefaultUnauthenticatedRole**.
+
+4. Also in the *estimate-age.html* file, replace **REGION** with your AWS Region.
+
+5. Open *estimate-age.html* in your browser, and follow the instructions onscreen.
+
+
+## Resources
+- [AWS SDK for JavaScript v2 API Reference Guide](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Rekognition.html)
+- [Amazon Rekognition Developer Guide - AWS SDK for JavaScript (v2) version of this example](https://docs.aws.amazon.com/rekognition/latest/dg/image-bytes-javascript.html)