README unclear

[koxon]

https://github.com/ipfs/go-ds-s3/blob/e903ac30040118bc2c82e35a9d500e52ba919d43/README.md?plain=1#L112

I don't see AWS_KEY/SECRET in this JSON blob. What are the IAM permission requirements on AWS side? What are the S3 actions I need in my IAM policy to authorize the plugin to operate on my bucket?

Does bucketsubdirectory get created automatically in the bucket if it doesn't exist?

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