Added a readme for Module 4 IDV webapp (#11)

Co-authored-by: Vineet <[email protected]>

identity-verification/module_4/README.md

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+# Amazon Rekognition Identity Verification (RIV)
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+The solution provides a sample of workflows to enable user registration, authentication, and updates to the user profile image.
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+- Register a new user using a face selfie
+- Register a new user after face match against an ID card with ID card data extraction
+- Authenticate returning user
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+## Solution Deployment
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+- <a href="https://console.aws.amazon.com/cloudformation/home?region=us-east-1#/stacks/create/template?stackName=Riv-Prod&amp;templateURL=https://aws-ml-blog.s3.amazonaws.com/artifacts/rekognition-identity-verification-solution/Riv-Prod.template.json" target="_blank" rel="noopener noreferrer"><img class="alignnone wp-image-37966 size-full" src="https://d2908q01vomqb2.cloudfront.net/f1f836cb4ea6efb2a0b1b99f41ad8b103eff4b59/2022/06/14/ML-8625-image006-launch-stack.png" alt="Launch stack button" width="107" height="20"></a>&nbsp; N. Virginia (<code>us-east-1</code>)
+- Invoke the web UI - The web portal is deployed with Amplify. On the Amplify console, locate the hosted web application environment (Riv-Prod) and the URL. Copy the URL and access it from your browser.
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