added map cache

lib/main.dart

@@ -1,14 +1,37 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_map_tile_caching/flutter_map_tile_caching.dart';
 import 'package:get/get.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:rogapp/pages/index/index_binding.dart';
 import 'package:rogapp/routes/app_pages.dart';
 import 'package:rogapp/utils/string_values.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:path/path.dart' as p;
+
+void main() async {
+  
+  WidgetsFlutterBinding.ensureInitialized();
+  
+  FlutterMapTileCaching.initialise(await RootDirectory.normalCache);
+  final StoreDirectory instanceA = FMTC.instance('OpenStreetMap (A)');
+    await instanceA.manage.createAsync();
+    await instanceA.metadata.addAsync(
+      key: 'sourceURL',
+      value: 'https://cyberjapandata.gsi.go.jp/xyz/std/{z}/{x}/{y}.png',
+    );
+    await instanceA.metadata.addAsync(
+      key: 'validDuration',
+      value: '14',
+    );
+    await instanceA.metadata.addAsync(
+      key: 'behaviour',
+      value: 'cacheFirst',
+    );
 
-void main() {
-  //WidgetsFlutterBinding.ensureInitialized();
   runApp(MyApp());
 }