Added loading screen on init

lib/views/menuListView.dart

@@ -1,6 +1,7 @@
 // ignore_for_file: unnecessary_this, file_names
 
 import 'package:flutter/material.dart';
+import 'package:iiitb_menu/constants.dart';
 import 'package:iiitb_menu/models/globalModel.dart';
 import 'package:iiitb_menu/widgets/itemCard.dart';
 import 'package:provider/provider.dart';
@@ -15,6 +16,11 @@ class MenuListView extends StatelessWidget {
       builder: (BuildContext context, GlobalModel data, Widget? child) {
         // print(data.date);
         // print(data.mainData["dates"][data.date]);
+        DataStatus dataStatus = data.menuAvailable;
+        if (dataStatus == DataStatus.Loading) {
+          return const Center(
+              child: Text("Loading...", style: TextStyle(fontSize: 40)));
+        }
         String menuIndex = data.mainData["dates"][data.date];
         return Column(
           children: [