Kubertnes API access docs

[aleoli]

Description

This PR adds the documentation on how to configure the access to the Kubernetes APIs for offloaded Pods

[adamjensenbot]

Hi @aleoli. Thanks for your PR!

I am @adamjensenbot.
You can interact with me issuing a slash command in the first line of a comment.
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• /rebase: Rebase this PR onto the master branch (You can add the option test=true to launch the tests
  when the rebase operation is completed)
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Make sure this PR appears in the liqo changelog, adding one of the following labels:

• kind/breaking: 💥 Breaking Change
• kind/feature: 🚀 New Feature
• kind/bug: 🐛 Bug Fix
• kind/cleanup: 🧹 Code Refactoring
• kind/docs: 📝 Documentation

[aleoli]

/rebase test=true

[aleoli]

/merge