Updated the top-level README

cloud_templates/README.md

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+# Data ingestion and visualization with AWS CloudFormation templates
+
+These CloudFormation templates are prepared to deploy to the cloud and visualize the data coming from your Expresslink. To learn more about AWS CloudFormation, see [**What is CloudFormation?**](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html)
+
+These templates are designed in four different patterns to ingest your IoT data using: 
+
+1.  Amazon Timestream
+<br>
+<center><img src="https://d2908q01vomqb2.cloudfront.net/f6e1126cedebf23e1463aee73f9df08783640400/2022/04/04/Blog-IoT-Reporting-3-Timstream.png" alt="alt text"/></center>
+</br>
+
+2. AWS IoT Analytics 
+<br>
+<center><img src="https://d2908q01vomqb2.cloudfront.net/f6e1126cedebf23e1463aee73f9df08783640400/2022/04/04/Blog-IoT-Reporting-3-IotAnalytics.png" alt="alt text"/></center>
+</br>
+
+3. Amazon Kinesis Data Firehose 
+
+<br>
+<center><img src="https://d2908q01vomqb2.cloudfront.net/f6e1126cedebf23e1463aee73f9df08783640400/2022/04/04/Blog-IoT-Reporting-3-KinesisAthena.png" alt="alt text"/></center>
+</br>
+
+4. Amazon OpenSearch Service
+<br>
+<center><img src="https://d2908q01vomqb2.cloudfront.net/f6e1126cedebf23e1463aee73f9df08783640400/2022/04/04/Blog-IoT-Reporting-3-OpenSearch.png" alt="alt text"/></center>
+</br>
+
+The subdirectories contain the following: 
+
+* Under `demo` directory, there are the demo templates along with a sample program to run on your Expresslink. 
+* Under `aws_cdk` directory, there are the CDK (Cloud Development Kit) stacks used to crate the CloudFormation templates. See [What is the AWS CDK](https://docs.aws.amazon.com/cdk/v2/guide/home.html) to learn more about AWS CDK.
+* Under `user_guides` directory you can find the guides to get started with the templates and how to customize them with AWS CDK.