Feature/run scheduled job via script (#1989)

* Create run-scheduled-job.js

Adding the code

* Create README.md

Added readme file

* Update README.md

Added instructions to readme

Author: niamccash

Server-Side Components/Background Scripts/Run a Scheduled Job/README.md

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+A script to run an existing Scheduled Job programmatically. Can be used as Background script, in a Script Include or anywhere a server side script is available.
+Replace `sys_id` with the Sys ID of the Scheduled Job to be run.

Server-Side Components/Background Scripts/Run a Scheduled Job/run-scheduled-job.js

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+ // Generic/parent scheduled job table = sysauto
+ var grScheduledJob = new GlideRecord("sysauto");
+ if (grScheduledJob.get(sys_id)) {
+	// In order to run the job successfully, we need the more specific
+	// child table name of the scheduled job (eg. sysauto_script)
+     var classname = grScheduledJob.getValue('sys_class_name');
+     var scheduledJob = new GlideRecord(classname);
+     if (scheduledJob.get(sys_id))
+         gs.executeNow(scheduledJob);
+ }