Add readmes.

README.adoc

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+= Cloud Native Testing: AWS Technologies
+
+This repository contains example code for AWS-based technologies and how to efficiently test them, without necessarily
+having access to an actual AWS environment.
+
+All examples are based on _our_ experience in different actual small and large scale projects.
+
+== Examples
+
+** link:examples/s3/[S3]

examples/s3/README.adoc

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+= AWS: S3
+
+This module demonstrates the basics of using and testing the AWS Simple Storage Service. It contains a simple service
+that allows you to store and fetch book cover images. You can interact with it locally through IntelliJ's
+link:../s3/http/S3.http[http plugin].
+
+The module includes examples for how to:
+
+- Write a reasonable abstraction layer for the S3 sdk
+- Locally run an S3 instance with your application thanks to with link:https://localstack.cloud/[LocalStack]
+- Write tests which use a locally running S3 instead of a simple mock