[WIP] Add Kubernetes Hardening Guide

[cailyn-codes]

Addresses issue kubernetes/sig-security#30 in k/sig-security repository.

This is a draft for the Kubernetes Hardening Guide from the collaborative document. There are still lots of areas that need to be fleshed out before this PR is ready for review.

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[savitharaghunathan]

/sig security

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[sftim]

@cailynse, how can we help you move this work forward?

[cailyn-codes]

Hey @sftim ! I've been a bit swamped but have lots of time over the holidays to work away on it. @raesene and I have a meeting booked for this week to talk about repurposing some of the material from his blog to make it a bit easier.

[divya-mohan0209]

Hello @cailynse , checking in. Is there anything we can do to help here?

[cailyn-codes]

Hi @divya-mohan0209 - sorry, been swamped with a few other things. I'll work. on breaking this down more clearly this week so it's easier for folks to contribute.

[cailyn-codes]

After some discussion we have decided to create separate pages for the sections of the hardening guide. I will close this PR as we will open separate PRs for each section to make it easier for folks to pick up a specific section.