Add a sidecar example

docs/examples/sidecar/README.md

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+# Sidecar Example
+
+This example adds an additional container in the rabbitmq pod using the StatefulSet override. You can add multiple additional containers and add additional containers to `initContainers` as well.
+
+You can deploy this example:
+
+```shell
+kubectl apply -f rabbitmq.yaml
+```

docs/examples/sidecar/rabbitmq.yaml

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+apiVersion: rabbitmq.com/v1beta1
+kind: RabbitmqCluster
+metadata:
+  name: sidecar
+spec:
+  replicas: 1
+  override:
+    statefulSet:
+      spec:
+        template:
+          spec:
+            containers:
+            - name: additional-container
+              image: busybox
+              command: ['sh', '-c', 'echo "Hello, Kubernetes!" && sleep 5000']

docs/examples/sidecar/test.sh

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+#!/bin/bash
+
+kubectl get pod sidecar-server-0 -o jsonpath="{.spec.containers[*].image}" | grep busybox
+kubectl get pod sidecar-server-0 | grep 2/2
+