chore(ckeditor5-footnotes): initialize empty plugin

packages/ckeditor5-footnotes/src/index.ts

@@ -0,0 +1,8 @@
+import ckeditor from './../theme/icons/ckeditor.svg';
+import './augmentation.js';
+
+export { default as Footnotes } from './footnotes.js';
+
+export const icons = {
+	ckeditor
+};