AETHER-761 Add support of private image registry with auth enabled

Change-Id: I25e804570357c513bfd1822ab9d971c7ed1c5405
diff --git a/omec/omec-control-plane/values.yaml b/omec/omec-control-plane/values.yaml
index c8ef894..13b0a33 100644
--- a/omec/omec-control-plane/values.yaml
+++ b/omec/omec-control-plane/values.yaml
@@ -13,6 +13,11 @@
     spgwc: docker.io/omecproject/spgw:master-latest
     depCheck: quay.io/stackanetes/kubernetes-entrypoint:v0.3.1
   pullPolicy: IfNotPresent
+  credentials: {}
+  # If specified, use this credential to access the image
+  #   registry:
+  #   username:
+  #   password:
 
 nodeSelectors:
   enabled: false