IO Example

Read file: ```no_run use citi::Record; use std::fs::File;

let mut file = File::open("file.cti").unwrap(); let record = Record::from_reader(&mut file); ```

Write file: ```no_run use citi::Record; use std::fs::File;

let record = Record::default(); let mut file = File::create("file.cti").unwrap(); record.to_writer(&mut file); ```