[Concept] Exercise - References

[vaeng]

This is a heavily edited port of the "Election Day" concept exercise from the go track: https://github.com/exercism/go/tree/main/exercises/concept/election-day

It should teach how to use references in functions, how to call reference member types and to write a function that has a reference as a return type.

[BethanyG]

@vaeng -- I am a bit overwhelmed this morning (July 6th), and also have a long meeting this afternoon. However, I will get to this late afternoon/evening my time (PDT). 😄 Apologies for the delay.

[vaeng]

Thanks for the review! If you don't complain about the text, I'll merge and see if someone else complains afterward 👯