add default basic entries in settings,js

- defaults to "ace" but provides instruction for using monaco

packages/node_modules/node-red/settings.js

@@ -337,6 +337,21 @@ module.exports = {
                 // section of 'User Settings' within the editor
                 mode: "manual"
             }
-        }
+        },
+        codeEditor: {
+            lib: "ace", //can be "monaco" or "ace"
+            options: { 
+                //// theme - must match the file name of a theme in 
+                //// packages/node_modules/@node-red/editor-client/src/vendor/monaco/dist/theme
+                //// e.g. "tomorrow-night", "upstream-sunburst", "github", "my-theme"
+                theme: "vs",
+                //// other overrides can be set e.g. fontSize, fontFamily, fontLigatures etc.
+                //// for the full list, see https://microsoft.github.io/monaco-editor/api/interfaces/monaco.editor.istandaloneeditorconstructionoptions.html
+                //fontSize: 14,
+                //fontFamily: "Cascadia Code, Fira Code, Consolas, 'Courier New', monospace"
+                //fontFamily: "Cascadia Code, Fira Code, Consolas, 'Courier New', monospace"
+                //fontLigatures: true,
+            }
+        },
     }
 }