Add azure event hubs pub/sub how to (#561)

* add azure event hubs pub/sub how to

* fix

howto/setup-pub-sub-message-broker/README.md

@@ -49,3 +49,4 @@ kubectl apply -f pubsub.yaml
 - [Setup RabbitMQ](./setup-rabbitmq.md)
 - [Setup GCP Pubsub](./setup-gcp.md)
 - [Setup Hazelcast Pubsub](./setup-hazelcast.md)
+- [Setup Azure Event Hubs](./setup-azure-eventhubs.md)

howto/setup-pub-sub-message-broker/setup-azure-eventhubs.md

@@ -0,0 +1,46 @@
+# Setup Azure Event Hubs
+
+Follow the instructions [here](https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-create) on setting up Azure Event Hubs.
+Since this implementation uses the Event Processor Host, you will also need an [Azure Storage Account](https://docs.microsoft.com/en-us/azure/storage/common/storage-account-create?tabs=azure-portal).
+
+## Create a Dapr component
+
+The next step is to create a Dapr component for Azure Event Hubs.
+
+Create the following YAML file named `eventhubs.yaml`:
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: <NAME>
+  namespace: <NAMESPACE>
+spec:
+  type: pubsub.azure.eventhubs
+  metadata:
+  - name: connectionString
+    value: <REPLACE-WITH-CONNECTION-STRING> # Required.
+  - name: storageAccountName
+    value: <REPLACE-WITH-STORAGE-ACCOUNT-NAME> # Required.
+  - name: storageAccountKey
+    value: <REPLACE-WITH-STORAGE-ACCOUNT-KEY> # Required.
+  - name: storageContainerName
+    value: <REPLACE-WITH-CONTAINER-NAME > # Required.
+```
+
+The above example uses secrets as plain strings. It is recommended to use a secret store for the secrets as described [here](../../concepts/secrets/README.md)
+
+## Apply the configuration
+
+### In Kubernetes
+
+To apply the Azure Event Hubs pub/sub to Kubernetes, use the `kubectl` CLI:
+
+```bash
+kubectl apply -f eventhubs.yaml
+```
+
+### Running locally
+
+The Dapr CLI will automatically create a directory named `components` in your current working directory with a Redis component.
+To use Azure Event Hubs, replace the contents of `pubsub.yaml` (or `messagebus.yaml` for Dapr < 0.6.0) file with the contents of `eventhubs.yaml` above (Don't change the filename).