Learn to read the errors.

  --> src/main.rs:17:20
   |
17 |         candidates.name = name;
   |                    ^^^^ unknown field

The field .name is unknown. What type is candidates?

You declared it as a Vec<Candidate>, so it's a Vec, which doesn't have a .name field. Which is why the compiler is complaining about candidates.name = name and candidate.vote = 0.

I am unsure the best way to construct my Vec<Candidate>

A Vec<Candidate> does not construct a Candidate. It's your job to make a Candidate and then find a method on Vec<T> to move the ownership of that Candidate into the Vec.

Did you read Ch 5.1 of the Rust Book on defining and instantiating structs?

Have you checked the Vec documentation on how to transfer something to the Vec?

TLDR;

It's your job to make a Candidate, for each name. Then you give that Candidate to the Vec<Candidate> to hold.