add prerequisite for mq appliance dc

host/README.md

@@ -58,6 +58,8 @@ export DC_CONFIG=config/config-mqappliance.yaml
 ```bash
 ./gradlew run
 ```
+*Note:* If you want to monitor IBM MQ appliance, you need to install **expect** before starting the Data Collector. You can run the command `which expect` to check if **expect** is already installed.
+
 5) Option-2: Find the deployment package (otel-dc-host-*.tar) generated by gradle in the "build/distributions/" directory, extract deployment files:
 ```bash
 cd build/distributions/
@@ -78,6 +80,7 @@ Run the Data Collector with following command according to your current OS:
 ```bash
 bin/otel-dc-host
 ```
+*Note:* If you want to monitor IBM MQ appliance, you need to install **expect** before starting the Data Collector. You can run the command `which expect` to check if **expect** is already installed.
 
 ## Create Data Collector implementation for a new type of host