Add metadata to helm chart: readme, changelog

[hpvd]

would be pretty handy and give the perfect professional grade, to have the README and the changelog within the helm chart.
usecase: e.g. in deployment tools or in public places like artifacthub.i.o

README:

function mesh: no README
https://artifacthub.io/packages/helm/function-mesh/function-mesh-operator

example with included README:
kube prometheus stack
https://artifacthub.io/packages/helm/prometheus-community/kube-prometheus-stack

background: https://helm.sh/docs/topics/charts/#chart-license-readme-and-notes
check with https://helm.sh/docs/helm/helm_show_readme/

Changelog:

function mesh: no Changelog
https://artifacthub.io/packages/helm/function-mesh/function-mesh-operator

example with included CHANGELOG
Apache Airflow
https://artifacthub.io/packages/helm/apache-airflow/airflow?modal=changelog

[hpvd]

• readme shows up nicely e.g. on
  https://artifacthub.io/packages/helm/function-mesh/function-mesh-operator
• changelog not available