chore(docs): improve README for ingress

[wrenix]

Description of the change

We should start to documentate to use different ingress-controller correct.

Benefits

Documentation like in #492

Possible drawbacks

Documentation is not tested

Additional information

Is not perfect, yet. but a start for a documentation for ingress.

Checklist

• [ ] I have read the CONTRIBUTING.md doc.
• [x] DCO has been signed off on the commit.
• [x] Chart version bumped in Chart.yaml according to semver.
• [x] (optional) Parameters are documented in the README.md

[wrenix]

is the last version okay?

[wrenix]

rebased (and bump version)