WIP: add option to vote on polls

lib/api/marianumcloud/talk/votePoll/votePollParams.dart

@@ -0,0 +1,14 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import '../../../apiParams.dart';
+
+part 'votePollParams.g.dart';
+
+@JsonSerializable()
+class VotePollParams extends ApiParams {
+  List<int> optionIds;
+
+  VotePollParams({required this.optionIds});
+  factory VotePollParams.fromJson(Map<String, dynamic> json) => _$VotePollParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$VotePollParamsToJson(this);
+}