Adds db helper requsts for flights pertaining to drones/batteries, and config class with generated json serializer

lib/config.dart

@@ -0,0 +1,16 @@
+// This file holds a class to represent the configuration/settings of the app
+
+import 'package:json_annotation/json_annotation.dart';
+part 'generated/config.g.dart';
+
+@JsonSerializable()
+class RTimeConfig {
+  final String language;
+
+  RTimeConfig({required this.language});
+
+  factory RTimeConfig.fromJson(Map<String, dynamic> json) =>
+      _$PersonFromJson(json);
+
+  Map<String, dynamic> toJson() => _$PersonToJson(this);
+}