Calculate ticket age (ServiceNowDevProgram#744)

* Create script.js in ticket age

* Create readme.md in ticket age

Author: riya-misra-1

Flow Actions/Calculate Ticket Age/readme.md

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+This is a custom action that calculate the age of the ticket/incident on the basis of its created date which is started date and the date at which it is updated.
+
+
+Input Variable:
+
+1. Start Date Type-Date/Time, Mandatory
+2. End Date  Type-Date/Time, Mandatory
+
+Output variable:
+1. Ticket Age  Type-string

Flow Actions/Calculate Ticket Age/script.js

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+(function execute(inputs, outputs) {
+var start_date = new GlideDateTime(inputs.start_date); //created date
+  var end_date = new GlideDateTime(inputs.end_date);  //updated
+  outputs.ticket_age = GlideDateTime.subtract(start_date,end_date).getDisplayValue();
+})(inputs, outputs);