The sig-node document invites users to participate in
kubernetes.slack.com Slack group. But as a new user I
got stuck trying to login there. This PR therefore provides
a link where one should go get the invitation prior trying
to use Kubernetes Slack channels.
Signed-off-by: Miha Pleško <miha.plesko@xlab.si>
Christoph Blecker
Jamie Hannaford
Miha Pleško
Tim St. Clair
Aaron Crickenberger