feat: Add Business Rule snippet for close code validation

Author: arjav007

Server-Side Components/Business Rules/Prevent-Invalid-State-Change/README.md

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+# Prevent Incident Closure Without a Close Code
+
+This snippet is for a **'before' Business Rule** that prevents a user from closing an incident if the 'Close Code' field is empty. It displays an error message and aborts the update.
+
+## How to Use
+
+1.  **Table:** `incident`
+2.  **When:** `before`
+3.  **Actions:** Check `update`
+4.  **Condition (Filter):**
+    * `State | changes to | Closed`
+    * *(Note: 'Closed' is often value 7, but check your instance)*
+5.  **Advanced Tab:**
+    * Check the `Advanced` box.
+    * Paste the code from `prevent_closure.js` into the script field.

Server-Side Components/Business Rules/Prevent-Invalid-State-Change/prevent_closure.js

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+(function executeRule(current, previous /*, gs, sup*/) {
+
+  // Check if the close_code field is empty or null
+  // You can add other fields to this check, e.g., || gs.nil(current.close_notes)
+  if (gs.nil(current.close_code)) {
+
+      // Display an error message at the top of the form
+      gs.addErrorMessage('A Close Code is required before closing an incident.');
+
+      // Stop the database action (update) from happening
+      current.setAbortAction(true);
+  }
+
+})(current, previous);