Update README.md

Updated ReadMe

Author: ajkeane-aws

README.md

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 # AWS DataSync Deployment for Azure
 
-This repository contains a script designed to convert the DataSync Agent VHDX to VHD  on Amazon Linux 2 (AL2), and upload the generated disk to Azure and create an Azure Virtual Machine.
+This repository contains a script designed to convert the DataSync Agent VHDX to VHD  on Amazon Linux 2 (AL2), and upload the generated disk to Azure and create an Azure Virtual Machine. The script can create the DataSync Virtual Machine in a **new** Azure vNet and Subnet or it can also use an **existing** Azure vNET and Subnet. Please review the Parameters section for deployment options.
 
 ## Getting Started