Problem/Motivation

GraphlQL does not support mutation for inserting Poll Vote

Proposed resolution

1. Create a separate module which supports the PollVoteCreateInput mutation for adding votes.
2. Make a new PollVote Entity in Poll module which will be then supported by GraphQL.

This sandbox is a build of the 1st approach for the purpose of gathering feedback. It's inspired by GraphQL Flag, which "Provides an integration between GraphQL and Flag modules."