added id to category

trackeroo/lib/logic/models/category.dart

@@ -6,18 +6,22 @@ part 'category.g.dart';
 @HiveType(typeId: 0)
 class Category {
   @HiveField(0)
-  String title;
+  int id;
 
   @HiveField(1)
-  IconData icon;
+  String title;
 
   @HiveField(2)
-  Color color;
+  IconData icon;
 
   @HiveField(3)
+  Color color;
+
+  @HiveField(4)
   double budget;
 
   Category({
+    required this.id,
     required this.title,
     required this.icon,
     required this.color,
@@ -27,6 +31,7 @@ class Category {
 
   factory Category.fromJson(Map<String, dynamic> parsedJson) {
     return Category(
+      id: parsedJson['id'],
       title: parsedJson['title'],
       icon: parsedJson['icon'],
       color: parsedJson['color'],