Add a README for docs/examples

docs/examples/README.md

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+## Messaging Topology Operator examples
+
+This section contains examples on how to create RabbitMQ topology objects using the Messaging Topology Operator.
+
+### Usage
+
+These examples are intended to showcase common use cases for the Messaging Topology Operator. Some examples can be used directly, but
+properties such as resources names and namespaces need to be edited for your own environment. For a more comprehensive guide on how
+to use the Operator, see the [Using Messaging Topology Operator](https://www.rabbitmq.com/kubernetes/operator/using-topology-operator.html)
+guide on `rabbitmq.com` and the Operator [API reference](https://github.com/rabbitmq/messaging-topology-operator/blob/main/docs/api/rabbitmq.com.ref.asciidoc).
+