add all frontend files

node_modules/rc-table/lib/sugar/ColumnGroup.js

@@ -0,0 +1,16 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+/* istanbul ignore next */
+/**
+ * This is a syntactic sugar for `columns` prop.
+ * So HOC will not work on this.
+ */
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function ColumnGroup(_) {
+  return null;
+}
+var _default = exports.default = ColumnGroup;