Add comments to cron propeties in application.properties file

Author: obasekiosa

src/main/resources/application.properties

@@ -51,5 +51,11 @@ sparql.endpoint = http://localhost:3030/cwlviewer/
 #=======================
 # Scheduler settings
 #=======================
+
+# Cron expression that specifies the interval for running deletes of old queued workflow
+# For more info see https://spring.io/blog/2020/11/10/new-in-spring-5-3-improved-cron-expressions#usage
+# The expression below implies every hour at the 0th second and 0th minute i.e (01:00:00, 02:00::00,... etc)
 cron.deleteOldQueuedWorkflows = 0 0 * * * ?
+
+# Age limit for queued workflows in hours.
 queuedWorkflowAgeLimitHours = 24