Adding an https-url import definition example to import a large impor…

docs/examples/import-https-url-definition/README.md

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+# Import Definitions Example
+
+You can import definitions, which contain definitions of all broker objects from a URL accessible over HTTPS. [Learn more about export and import rabbitmq definitions](https://www.rabbitmq.com/definitions.html#import).
+
+This is useful also for very large definitions (thousands of queues) when the config map maximum size of 1Mb is not enough.
+
+You can rely on these RabbitMQ configuration parameters:
+
+```
+definitions.import_backend = https
+definitions.https.url = https://raw.githubusercontent.com/rabbitmq/sample-configs/main/lot-of-queues/5k-queues.json
+definitions.tls.versions.1 = tlsv1.2
+```
+
+Check out `rabbitmq.yaml` as an example.
+
+Keep in mind that exported definitions contain all broker objects, including users. This means that the default-user credentials will be imported from the definitions, and will not be the one which is generated at the creation of the deployment as a kubernetes secret object.
+
+
+

docs/examples/import-https-url-definition/rabbitmq.yaml

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+apiVersion: rabbitmq.com/v1beta1
+kind: RabbitmqCluster
+metadata:
+  name: import-https-url-definitions 
+spec:
+  service:
+    type: NodePort
+  replicas: 1
+  resources:
+    requests:
+      cpu: 2
+      memory: 8Gi
+    limits:
+      cpu: 2
+      memory: 8Gi
+  rabbitmq:
+    additionalConfig: |
+      definitions.import_backend = https
+      definitions.https.url = https://raw.githubusercontent.com/rabbitmq/sample-configs/main/lot-of-queues/5k-queues.json
+      definitions.tls.versions.1 = tlsv1.2
+      vm_memory_high_watermark_paging_ratio = 0.85