add NotFound page

src/containers/NotFound.js

@@ -0,0 +1,25 @@
+import React, { Component } from 'react';
+import { Link } from 'react-router-dom';
+import Card from '../components/Card';
+
+class NotFound extends Component {
+  constructor(props) {
+    super(props);
+
+    this.state = {};
+  }
+
+  render() {
+    return (
+      <div>
+        <Card 
+          title="404 - Page not found"
+          message="The page is not found."
+          footer={<Link to="/">Go to home</Link>}
+          />
+      </div>
+    );
+  }
+}
+
+export default NotFound;