Expand on the README

Author: chiradeep

README.md

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-Netscaler AWS Cloudformation templates
+Citrix NetScaler AWS Cloudformation templates
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-**Introduction**
-----------------
+This is a repository for [Citrix NetScaler's](https://www.citrix.com/products/netscaler-adc/) CloudFormation templates for deploying Citrix NetScaler in AWS (Amazon Web Services). 
 
-Welcome to the GitHub repository for Citrix Netscaler's CloudFormation templates for deploying Netscaler in Amazon Web Services. All of the templates in this repository have been developed by the Netscaler engineering team. There are two main directories: Supported and Experimental
+## Citrix NetScaler VPX
+Citrix NetScaler VPX is a virtual application delivery controller that combines the latest cloud-native features with a simple user experience. The NetScaler optimizes the user experience ensuring that applications are always available by using advanced L4-7 load balancing, traffic management and proven application acceleration such as HTTP compression and caching.
 
-**Supported**
-The Supported directory has Netscaler CloudFormation templates that have been created and fully tested by the Citrix team. Should you run into any issues while using these templates, you can get from Citrix Technical Support teams through standard procedures.
+## Citrix NetScaler VPX in AWS
+Citrix NetScaler VPX is available as Amazon Machine Images (AMI) in the [AWS Marketplace](https://aws.amazon.com/marketplace/seller-profile?id=fb9c6078-b60f-47f6-8622-49d5e1d5aca7). Before using a CloudFormation template to provision a Citrix NetScaler VPX in AWS, the AWS user has to accept the terms and subscribe to the AWS Marketplace product. Each edition of the Citrix NetScaler VPX in the Marketplace requires this step.
+
+## About these CloudFormation templates
+Each template in this repository has colocated documentation describing the usage and architecture of the template. The templates attempt to codify recommended deployment architecture of the Citrix NetScaler VPX, or to introduce the user to the Citrix NetScaler or to demonstrate a particular feature / edition / option. Users can re-use / modify or enhance the templates to suit their particular production and testing needs. Most templates require full EC2 permissions as well as permissions to create IAM roles.
+
+## A note on AMI Ids
+The CloudFormation templates contain AMI Ids that are specific to a particular release of the Citrix NetScaler VPX (e.g., release 12.0-56.20) and edition (e.g., Citrix NetScaler VPX Platinum Edition - 10 Mbps). To use a different version / edition of the Citrix NetScaler VPX with a CloudFormation template requires the user to edit the template and replace the AMI Ids.
+
+## Versioning
+The master branch of the repository generally has the latest version of the template. Older versions can be found in the appropriately labeled branches.
+
+## Support
+For production issues with the templates, please contact Citrix Support through your normal support channels. If you have fixes / suggestions for improvements or requests, please raise an issue in this repository.
+
+## Further reading
+- VPX installation in AWS : https://docs.citrix.com/en-us/netscaler/12/deploying-vpx/install-vpx-on-aws.html
+- Citrix NetScaler 12.0 Documention : https://docs.citrix.com/en-us/netscaler/12.html 
+- Citrix NetScaler Overview : https://www.citrix.com/products/netscaler-adc/resources/netscaler-vpx.html
 
-**Experimental**
-The Experimental directory has CloudFormation templates that have not yet completed full testing and are subject to change. Citrix does not provide technical support for templates in this directory. Caution is advised while using these templates.