Added Page Not Found route

src/pages/404/PageNotFound.jsx

@@ -0,0 +1,7 @@
+import React from 'react';
+
+export default function PageNotFound() {
+    return (
+        <h1>Sorry, but the thing you are looking for is definitely not here :(</h1>
+    );
+}

src/routes.js

@@ -6,6 +6,7 @@ import IndexPage from 'pages/index/IndexPage';
 import AuthPage from 'pages/auth/AuthPage';
 
 import RulesPage from 'pages/rules/RulesPage';
+import PageNotFound from 'pages/404/PageNotFound';
 
 import ProfilePage from 'pages/profile/ProfilePage';
 import ProfileChangePasswordPage from 'pages/profile/ChangePasswordPage';
@@ -69,6 +70,8 @@ export default function routesFactory(store) {
                 <Route path="change-username" component={ProfileChangeUsernamePage} />
                 <Route path="change-email(/:step)(/:code)" component={ProfileChangeEmailPage} />
             </Route>
+
+            <Route path="*" component={PageNotFound} />
         </Route>
     );
 }