docs: add tutorial for usage with Anexia Engine

[davidkroell]

What does it do ?

Adds documentation for usage with Anexia Engine.

Motivation

Tutorial was missing.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: davidkroell / name: David Kröll (25404ef, 3387edb, b35856c)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @davidkroell. Thanks for your PR.

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[ivankatliarchuk]

Not sure is this repository is the right location. Most likely this tutorial is more relevant here https://engine.anexia-it.com/docs/en or here https://github.com/anexia/k8s-external-dns-webhook

[davidkroell]

Hi @ivankatliarchuk that's only here because a lot of other providers also have tutorials in the documentation here. If it's no longer wanted this way it is no problem at all - just let me know.

[szuecs]

CLA check failing

[szuecs]

Best would be to have a link to docs page somewhere else @davidkroell .
Of course I think we can serve here as a main hub for links for all webhook providers, such that users can easily navigate to the right docs.

I would suggest to add a 2-3 lines page that links your own provider page, that can have the content. What do you think?