/// <summary>
 /// Add Minutes
 /// </summary>
 /// <param name="i"></param>
 /// <param name="minutes"></param>
 /// <returns></returns>
 /// <exception cref="ArgumentNullException"></exception>
 public static Instant AddMinutes(this Instant i, double minutes) => i.PlusMinutes(minutes);
 /// <summary>
 /// Add Minutes
 /// </summary>
 /// <param name="i"></param>
 /// <param name="minutes"></param>
 /// <returns></returns>
 /// <exception cref="ArgumentNullException"></exception>
 public static Instant AddMinutes(this Instant i, long minutes) => i.PlusMinutes(minutes);