add initial react app

common/app/App.jsx

@@ -0,0 +1,25 @@
+import React, { PropTypes } from 'react';
+
+import Nav from './components/Nav';
+import Footer from './components/Footer';
+
+export default class extends React.Component {
+  constructor(props) {
+    super(props);
+  }
+
+  static displayName = 'FreeCodeCamp'
+  static propTypes = {
+    children: PropTypes.node
+  }
+
+  render() {
+    return (
+      <div>
+        <Nav />
+        { this.props.children }
+        <Footer />
+      </div>
+    );
+  }
+}