📖 Add cluster-resource-set-controller to docs

[ramineni]

What this PR does / why we need it:
Add a documentation page on ClusterResourceSet controller
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #5475

[k8s-ci-robot]

Hi @ramineni. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ramineni]

/assign @killianmuldoon

[sbueringer]

/ok-to-test

/cc @killianmuldoon

[ramineni]

@killianmuldoon updated. PTAL

[killianmuldoon]

One last nit - could you move the position in Summary.md to Just below the ClusterTopology controller?

[sbueringer]

Thx!

Please squash the commits, otherwise lgtm from my side

[sbueringer]

/lgtm
/approve
/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

/lgtm
/approve
/cherry-pick release-1.2

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[killianmuldoon]

/lgtm

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #6798

In response to this:

/lgtm
/approve
/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.