Adding Bottom Navigation bar

lib/ui/landing.dart

@@ -0,0 +1,34 @@
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:le_kiosque_by_gcs/services/auth/auth.dart';
+import 'package:le_kiosque_by_gcs/ui/auth.dart';
+import 'package:le_kiosque_by_gcs/ui/main.dart';
+
+class LandingPageView extends StatelessWidget {
+  final Auth auth;
+
+  const LandingPageView({Key key, this.auth}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder<User>(
+        stream: auth.authStateChanges(),
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.active) {
+            if (snapshot.data == null) {
+              return AuthView(auth: auth);
+            } else {
+              return MainView();
+            }
+          }
+          else {
+            return Scaffold(
+              body: Center(
+                child: CircularProgressIndicator(),
+              ),
+            );
+          }
+        }
+    );
+  }
+}