Add MQTT project that builds on the task pool project - currently the library is building but not being used.

FreeRTOS-Plus/Demo/FreeRTOS_IoT_Libraries/task_pool/DemoTasks/SimpleTaskPoolExamples.c

@@ -182,6 +182,8 @@ uint32_t ulLoops = 0;
 
 static void prvSimpleTaskNotifyCallback( IotTaskPool_t pTaskPool, IotTaskPoolJob_t pJob, void *pUserContext )
 {
+/* The jobs context is the handle of the task to which a notification should
+be sent. */
 TaskHandle_t xTaskToNotify = ( TaskHandle_t ) pUserContext;
 
 	/* Remove warnings about unused parameters. */
@@ -468,6 +470,7 @@ IotTaskPoolJobStatus_t xJobStatus;
 													   prvSimpleTaskNotifyCallback,
 													   (void * ) xTaskGetCurrentTaskHandle(),
 													   &( xJobs[ xIndex ] ) );
+			configASSERT( xResult == IOT_TASKPOOL_SUCCESS );
 		}
 	}