started on adding openid login

.env.example

@@ -11,6 +11,18 @@ NEXTAUTH_SECRET=your-secret
 NEXTAUTH_URL=http://localhost:3000
 NEXT_PUBLIC_BASE_URL=http://localhost:3000
 
+# OIDC Configuration (optional)
+OIDC_ENABLED=true
+OIDC_PROVIDER_NAME="Company SSO"  # Display name for the button
+OIDC_CLIENT_ID=your-oidc-client-id
+OIDC_CLIENT_SECRET=your-oidc-client-secret
+OIDC_ISSUER=https://your-oidc-provider.com/auth/realms/your-realm
+
+# Optional: Role mapping
+OIDC_ROLE_CLAIM=roles
+OIDC_ADMIN_ROLES=admin,superuser
+OIDC_PLANNER_ROLES=planner,editor
+
 # SMTP (optional)
 SMTP_HOST=smtpserver
 SMTP_PORT=587