Documentation for helm charts

[niallthomson]

Add a README for each helm chart. For now this should focus on documenting the values.

Example for inspiration https://github.com/aws/karpenter-provider-aws/tree/main/charts/karpenter

[dshamanthreddy]

I can work on this @niallthomson

[niallthomson]

Thanks @dshamanthreddy the helm charts can be found here https://github.com/aws-containers/retail-store-sample-app/tree/main/deploy/kubernetes/charts

You can ignore the opentelemetry one as it will likely be removed soon.