add usage examples

closes #1

examples/manifests/deployment.yaml

@@ -0,0 +1,35 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo-app
+spec:
+  selector:
+    matchLabels:
+      app: demo-app
+  template:
+    metadata:
+      labels:
+        app: demo-app
+    spec:
+      serviceAccountName: demo-app
+      containers:
+        - name: app
+          image: app:demo
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo-app-2
+spec:
+  selector:
+    matchLabels:
+      app: demo-app-2
+  template:
+    metadata:
+      labels:
+        app: demo-app-2
+    spec:
+      serviceAccountName: dev-app
+      containers:
+        - name: app
+          image: app:demo

examples/manifests/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - deployment.yaml
+  - serviceaccount.yaml

examples/manifests/serviceaccount.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: demo-app-1
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: dev-app