add apiVersion and kind in README.md for examples

examples/combineConfigs.md

@@ -158,6 +158,8 @@ height=10m
 EOF
 
 cat <<EOF >$DEMO_HOME/base/kustomization.yaml
+apiVersion: v1
+kind: Kustomization
 configMapGenerator:
 - name: my-configmap
   files:
@@ -191,6 +193,8 @@ dbpassword=mothersMaidenName
 EOF
 
 cat <<EOF >$OVERLAYS/development/kustomization.yaml
+apiVersion: v1
+kind: Kustomization
 bases:
 - ../../base
 namePrefix: dev-
@@ -273,6 +277,8 @@ dbpassword=thisShouldProbablyBeInASecretInstead
 EOF
 
 cat <<EOF >$OVERLAYS/production/kustomization.yaml
+apiVersion: v1
+kind: Kustomization
 bases:
 - ../../base
 namePrefix: prod-