Add TopMenu component and page specific content

src/components/TopMenu.js

@@ -0,0 +1,15 @@
+import React, { Component } from 'react';
+
+import './css/TopMenu.css';
+
+class TopMenu extends Component {
+    render() {
+        return (
+            <div id="topMenu">
+                {this.props.children}
+            </div>
+        );
+    }
+}
+
+export default TopMenu;