Add Custom Input to a Multi Choice Question

[berkayerten]

Users can not only select from the given options but also provide their own input which can be seen by the original author when the survey is closed.

• [x] Users are able to choose one of the given options OR click on something like Other and provide their own input
  • It is ok to select Other and not provide an opinion
• [x] isMultipleChoice is not mandatory to send. -> If Answers are null during creation, it means question is not multiple choice.
• [x] During survey creation author can select whether users can provide a custom input or not from the settings area