Update mobile login page

mobile/src/screens/index.js

@@ -0,0 +1,8 @@
+import { Home } from './Home'
+import { Login } from './Login'
+import { Navigation } from 'react-native-navigation'
+
+export function registerScreens() {
+  Navigation.registerComponent('app.Home', () => Home)
+  Navigation.registerComponent('app.Login', () => Login)
+}