feat: init the menu bar of workbench

src/workbench/menuBar/index.tsx

@@ -0,0 +1,15 @@
+import * as React from 'react';
+
+import { prefixClaName } from '@/common/className';
+
+import './menuBar.scss';
+
+export const MenuBar: React.FunctionComponent = function() {
+    return (
+        <div className={prefixClaName('menuBar')}>
+            MenuBar
+        </div>
+    );
+};
+
+export default MenuBar;

src/workbench/menuBar/menuBar.scss

@@ -0,0 +1,10 @@
+@import '@/style/const.scss';
+
+.#{$prefix}-menuBar {
+    position: absolute;
+
+    .left {
+        width: 48px;
+        height: 35px;
+    }
+}