Update README.md to include a link to the quickstart CloudFormation t…

…emplate.

This quickstart CloudFormation template is to host Orchard Core on Amazon ECS with S3 and Aurora PostgreSQL.

src/docs/reference/modules/Media.AmazonS3/README.md

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 The Amazon S3 Media module enables support for storing assets in Amazon S3 Buckets.
 
+!!! note
+    For a scalable Orchard Core that is fully deployed on AWS stack with ECS, you can refer to [the quickstart CloudFormation template](https://github.com/gcl-team/Experiment.OrchardCore.Main/blob/main/Infrastructure.yml).
+
 ## Amazon S3 Media Storage (`OrchardCore.Media.AmazonS3`)
 
 The feature replaces the default App_Data file-based media store with an Amazon Media Storage Provider.