Add jsonnet example

jsonnet-guestbook/params.libsonnet

@@ -0,0 +1,8 @@
+{
+  containerPort: 80,
+  image: "gcr.io/heptio-images/ks-guestbook-demo:0.2",
+  name: "guestbook-ui",
+  replicas: 1,
+  servicePort: 80,
+  type: "LoadBalancer",
+}