Create README.md

Author: debendu-das

Core ServiceNow APIs/GlideNavigation/Open a URL in a popup window/README.md

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+# g_navigation.openPopup(url, name, features, noStack)
+This method open a URL in a popup window with options to customize the popup’s behavior (e.g., resizable, scrollbars, etc.).
+
+### Example: Open Child Incidents in a Popup
+
+     var parentIncidentID = g_form.getUniqueValue();
+     g_navigation.openPopup('incident_list.do?sysparm_query=parent_incident=' + parentIncidentID, 'Child Incidents', 'resizable,scrollbars,status',true);
+
+This code opens a popup window to display all incidents that are children of a specific parent incident. It’s great for visualizing relationships between incidents without cluttering the main interface.