Dynamic reference qualifier with filtering (#2186)

* Create reference_qual_dynamic.js

* Create README.md

Author: MYaswanth28

Client-Side Components/Client Scripts/Dynamic Reference Qualifier with Filtering/README.md

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+**Dynamic Reference Qualifier with Filtering**
+This Client Script provides a solution for dynamically updating the available options in a Reference Field based on the value selected in another field on the same form.
+
+This technique is essential for ensuring data quality and improving the user experience (UX). 
+
+A typical use case is filtering the Assignment Group field to show only groups relevant to the selected Service, Category, or Location.

Client-Side Components/Client Scripts/Dynamic Reference Qualifier with Filtering/reference_qual_dynamic.js

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+ function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+    var controlledField = 'assignment_group'; 
+    var controllingField = 'u_service';     
+    var serviceSysId = g_form.getValue(controllingField);
+    var encodedQuery = 'typeLIKEITIL^u_related_service=' + serviceSysId;
+    g_form.setQuery(controlledField, encodedQuery);
+    var currentGroupSysId = g_form.getValue(controlledField);
+    if (currentGroupSysId && oldValue !== '' && currentGroupSysId !== '') {
+        g_form.setValue(controlledField, '');
+    }
+}