Add repo SECURITY.md

[joelsmith]

See kubernetes/committee-security-response#105

NONE

[k8s-ci-robot]

Hi @joelsmith. 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.

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

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: joelsmith
To complete the pull request process, please assign nilo19
You can assign the PR to them by writing /assign @nilo19 in a comment when ready.

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[feiskyer]

Merge manually since there is an error in github actions.