Update README.md with sig-security information

[savitharaghunathan]

Mirror README.md from - https://github.com/kubernetes/community/tree/master/sig-security

/good-first-issue

[k8s-ci-robot]

@savitharaghunathan:
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In response to this:

Mirror README.md from - https://github.com/kubernetes/community/tree/master/sig-security

/good-first-issue

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[PushkarJ]

@savitharaghunathan maybe there is an opportunity to combine this with this one: #14

[savitharaghunathan]

Ha thanks. I will mark this as a duplicate and close it.

[savitharaghunathan]

Duplicate issue. See #14.
/close

[k8s-ci-robot]

@savitharaghunathan: Closing this issue.

In response to this:

Duplicate issue. See #14.
/close

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.