add placeholder routes

src/client/Routes.js

@@ -6,6 +6,9 @@ export default () => {
   return (
       <div>
           <Route exact path="/" component={Home} />
+          <Route exact path="/users" component={() => 'Users'} />
+          <Route exact path="/admins" component={() => 'Admins List'} />
+          <Route exact path="/profile" component={() => 'Current User'} />
       </div>
   );
 };