Update README.md

[lauralorenz]

Add leads mailing list contact

Which issue(s) this PR fixes:
No issue. Came up in conversation when someone was looking for the leads mailing list.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lauralorenz
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[k8s-ci-robot]

@lauralorenz: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-community-verify	18049dd	link	true	/test pull-community-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[pacoxu]

This is generated from the template in

community/generator/sig_readme.tmpl

Line 32 in bfee8f7

The Chairs of the SIG run operations and processes governing the SIG.

.

Probably, we may add a general new attribute for leads mailing list.