Add SOS CKEditor configuration demo

ckeditor5_sos_demo.php

@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * Implements hook_civicrm_coreResourceList().
+ */
+function ckeditor5_sos_demo_civicrm_coreResourceList(&$items, $region) {
+  if ($region !== 'html-header') {
+    return;
+  }
+
+  $editorId = Civi::settings()->get('editor_id');
+  if (!in_array($editorId, ['CKEditor5-elfinder', 'CKEditor5-base64'], TRUE)) {
+    return;
+  }
+
+  Civi::resources()
+    ->addStyleFile('one.jonathandhn.ckeditor5sos', 'fonts/roboto/index.css', 20, 'html-header')
+    ->addScriptFile('one.jonathandhn.ckeditor5sos', 'js/editor-config.js', 20, 'html-header');
+}