added more blocs

lib/domains/transaction/models/transaction_description.dart

@@ -0,0 +1,19 @@
+import 'package:formz/formz.dart';
+
+enum TransactionDescriptionValidationError {
+  empty('Description empty'),
+  invalid('Description invalid');
+
+  final String message;
+  const TransactionDescriptionValidationError(this.message);
+}
+
+class TransactionDescription extends FormzInput<String, TransactionDescriptionValidationError> {
+  const TransactionDescription.pure() : super.pure('');
+  const TransactionDescription.dirty([super.value = '']) : super.dirty();
+
+  @override
+  TransactionDescriptionValidationError? validator(String value) {
+    return value.isEmpty ? TransactionDescriptionValidationError.empty : null;
+  }
+}