added lets encrypt cert

lib/main.dart

@@ -1,10 +1,19 @@
+import 'dart:io';
+import 'dart:typed_data';
+
 import 'package:app/state/timeStatusState.dart';
 import 'package:app/state/mapState.dart';
 import 'package:app/view/home.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
-void main() {
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  ByteData data = await PlatformAssetBundle().load('assets/ca/lets-encrypt-r3.pem');
+  SecurityContext.defaultContext.setTrustedCertificatesBytes(data.buffer.asUint8List());
+
   runApp(
     MultiProvider(
       providers: [