Basic budget sliders

lib/repositories/metadata/models/budget.dart

@@ -1,20 +1,24 @@
 class Budget {
+  String label;
   bool monthly;
   double value;
 
   Budget({
+    this.label = '',
     this.monthly = false,
     this.value = 0.0,
   });
 
   factory Budget.fromJson(Map<String, dynamic> json) {
     return Budget(
-      monthly: json['monthly'],
+      label: json['label'],
+      monthly: bool.parse(json['monthly']),
       value: double.parse(json['value']),
     );
   }
 
   Map<String, String> toJson() => {
+    'label': label,
     'monthly': monthly.toString(),
     'value': value.toString(),
   };