Function default_config 

pub fn default_config() -> ShiftCycleConfig

Creates a ShiftCycleConfig with all default values.

This is the starting point for most use cases:

use shift_algorithm::cycle::default_config;
use shift_algorithm::get_shift_info;

let config = default_config();
let info = get_shift_info(config.reference_date, &config, 0);
assert_eq!(info.day_of_cycle, 1);