[Documentation] Description when which s3-integration starter and client should be used.

[boal]

Relevant documentation

refarch-integrations

Problem description (optional)

Currently there is a refarch-s3-integration-rest-starter and a refarch-s3-integration-java-starter available. And there is also an image to run a refarch-s3-integration service.

It is not clear from the documentation what kind of starter/image should be used for which use case. Additionally, it is not clear which client starter can be used for which starter/image mentioned above.

Desired solution

The documentation in the README.md should be extended.

Additional context (optional)

No response

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