Merge pull request #3014 from Azure/addAwsReadmeFile

[data connectors] Add Aws S3 readme file

DataConnectors/AWS-S3/README.md

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+
+# AWS S3 Scripts
+The scripts under this directory can be used to configure AWS S3 connectors.
+These are optional scripts instead of set AWS configurations manually.
+
+# Script pre requirements 
+* PowerShell [Installation instructions](https://docs.microsoft.com/powershell/scripting/install/installing-powershell?view=powershell-7.1)
+* AWS CLI [Installation instructions](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html)