docs: Adding info about OpenID auth to README
Adding info about configuring OpenID authentication for the Kiali resource.
UNCLASSIFIED - NO CUI
ATTENTION: Immediate action is required to maintain compatibility with P1 services. Please visit https://p1notifications.dso.mil and see the "DSO.MIL Certificates Renewal" announcement under the "Notifications" section for more details.
Adding info about configuring OpenID authentication for the Kiali resource.
UNCLASSIFIED - NO CUI