Captures the time it took to assign a task (#1830)

* Create script.js

* Create README.md

Author: chetnadev

Server-Side Components/Business Rules/Captures the time it took to assign a task/README.md

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+This script tracks the time it took to assign a task (like an Incident, Change, etc.) by calculating the difference
+between when the record was created and when it was assigned (assigned_to was set).
+It checks if the assigned_to field has changed and is not empty.
+If it's the first time the record is being assigned (u_assignment_time is empty), it captures the current time.
+It then calculates the time difference between when the record was created and when it was assigned.
+This time difference (in minutes) is stored in a custom field u_time_to_assign.
+The goal is to track how long it took for the record to be assigned after creation
+
+
+## While this is possible to do via Metrics in ServiceNow (https://www.servicenow.com/docs/bundle/xanadu-platform-administration/page/use/reporting/concept/c_SampleFieldValueDurationScript.html), 
+## the script is being provided to potentially solve some edge cases.
+

Server-Side Components/Business Rules/Captures the time it took to assign a task/script.js

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+(function executeRule(current, previous /*null when async*/) {
+
+    // Only proceed if assigned_to changed AND is not empty/null
+    if (current.assigned_to.changes() && !gs.nil(current.assigned_to)) {
+        
+        gs.info("Assigned_to changed and assigned_to is: " + current.assigned_to);
+
+        // Only set u_assigned_time if empty
+        if (!current.u_assigned_time) {
+            
+            var assignedTime = new GlideDateTime();
+            current.u_assigned_time = assignedTime;
+
+            var createdTime = new GlideDateTime(current.sys_created_on);
+
+            var diffMillis = assignedTime.getNumericValue() - createdTime.getNumericValue();
+            var diffMinutes = diffMillis / (1000 * 60);
+
+            gs.info("Time difference in minutes: " + diffMinutes);
+
+            // Assuming u_time_to_assign is a string field
+            current.u_time_to_assign = diffMinutes.toFixed(2) + " minutes";
+            
+            gs.info("Set u_time_to_assign to: " + current.u_time_to_assign);
+        } else {
+            gs.info("u_assigned_time already set: " + current.u_assigned_time);
+        }
+    } else {
+        gs.info("Assigned_to not changed or is empty.");
+    }
+
+})(current, previous);