add basic oauth methods

lib/pages/login.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:slothmu/api/user.dart';
+import 'package:slothmu/business_logic/user.dart';
 import 'package:localization/localization.dart';
+import '../business_logic/auth/oauth.dart' as oauth;
 
 class Login extends StatefulWidget {
   const Login({Key? key}) : super(key: key);
@@ -64,6 +65,13 @@ class _LoginFormState extends State<LoginForm> {
                 if (!isValid) {
                   ScaffoldMessenger.of(context).showSnackBar(SnackBar(
                       content: Text("login-failed-snackbar-text".i18n())));
+                } else {
+                  Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (context) =>
+                            const AuthPage(baseurl: "kittycat.homes"),
+                      ));
                 }
               },
               icon: const Icon(Icons.login),
@@ -73,3 +81,21 @@ class _LoginFormState extends State<LoginForm> {
     );
   }
 }
+
+class AuthPage extends StatefulWidget {
+  const AuthPage({Key? key, required String baseurl}) : super(key: key);
+
+  @override
+  State<AuthPage> createState() => _AuthPageState();
+}
+
+class _AuthPageState extends State<AuthPage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: Text("hello"),
+      ),
+    );
+  }
+}