Include applying subresource in Running section

[discordianfish]

What type of PR is this?

/kind documentation
/kind feature

What this PR does / why we need it:

Following the readme before lead to the following error due to the missing subresource:

E0116 13:06:48.614623   66988 controller.go:233] error syncing 'default/example-foo': foos.samplecontroller.k8s.io "example-foo" not found, requeuing

Since CRD subresources are GA since 1.16, the readme should including applying them.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @discordianfish. Thanks for your PR.

I'm waiting for a kubernetes 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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.

[fedebongio]

/assign @yliaog
/triage accepted

[munnerz]

This looks good to me - should we go ahead and delete the non-status subresource version of this? (https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/sample-controller/artifacts/examples/crd.yaml) as I don't think there's ever a case where it's useful anymore?

/lgtm
/approve
/ok-to-test
/release-note-none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: discordianfish, munnerz

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• staging/src/k8s.io/sample-controller/OWNERS [munnerz]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-triage-robot]

The Kubernetes project has merge-blocking tests that are currently too flaky to consistently pass.

This bot retests PRs for certain kubernetes repos according to the following rules:

• The PR does have any do-not-merge/* labels
• The PR does not have the needs-ok-to-test label
• The PR is mergeable (does not have a needs-rebase label)
• The PR is approved (has cncf-cla: yes, lgtm, approved labels)
• The PR is failing tests required for merge

You can:

• Review the full test history for this PR
• Prevent this bot from retesting with /lgtm cancel or /hold
• Help make our tests less flaky by following our Flaky Tests Guide

/retest