added not-found container and route

Author: piotrwitek

src/app.tsx

@@ -21,6 +21,7 @@ function App() {
           <Route path="/" component={HomeContainer} />
           <Route path="/currency-converter" component={CurrencyConverterContainer} />
           <Route path="/css-modules" component={CssModulesContainer} />
+          <Route path="*" component={NotFoundContainer} />
         </Route>
       </Router>
     </Provider>

src/containers/not-found/index.tsx

@@ -0,0 +1,16 @@
+import * as React from 'react';
+import { Link } from 'react-router';
+import { PageSection } from '../../components/page-section';
+import { PageHero } from '../../components/page-hero';
+
+export default function () {
+  return (
+    <article>
+      <PageHero title="404 Not Found" subtitle="Page not found" />
+      <PageSection className="o-container o-container--small u-centered">
+        <Link to="/">Back to Home</Link>
+      </PageSection>
+      <br />
+    </article>
+  );
+};