cnpg-db helm chart including documentation, first draft

[wibed]

kindly review, works ootb.

helm chart for the postgres database accompanying the operator.
it is supposed to mirror the official crd as closely as possible to facilitate maintenance as changes occur.

there is a small documentation within the folder "examples" explaining the most central
parts the helm charts tries to facilitate, just to get a grasp a little bit faster.

but essentially it is a plain templated representation of the cloudnative-pg crd's .

[onedr0p]

Duplicate of #106

[wibed]

Duplicate of #106

its not! my version is a plain template of the crd's including most elements outlined there.
the pr you referred is much closer to wrapper including custom names and references injecting values into definitions instead of using plain yaml and a helper.tpl like this pr does.

[wibed]

what is the status on this pr?

[itay-grudev]

Closed as completed in #179. See also #178.