Add example?

Greetings.
I was kind of having a hard time getting the grasp of trying to use the digital GPIO pin. I worked it out in the end anyway, but I think it would be cool to add basic examples as simple as LED blinking, LED breathing, etc. like this:

extern crate linux_embedded_hal as hal;

use hal::sysfs_gpio::{Pin, Direction};
use std::error::Error;
use std::thread;
use std::time::Duration;

fn main() -> Result<(), Box<dyn Error>> {
    let gpio = Pin::new(198);

    match gpio.export() {
        Ok(()) => println!("Gpio {} exported!", gpio.get_pin()),
        Err(err) => println!("Gpio {} could not be exported: {}", gpio.get_pin(), err)
    }

    gpio.set_direction(Direction::Out)?;
    gpio.set_value(1)?;
    thread::sleep(Duration::from_secs(1));
    gpio.set_value(0)?;

    Ok(())
}

Begin with the Rust GPIO snippet in this issue and inspect the repository's existing conventions for examples. Add basic digital GPIO examples such as LED blinking and breathing, then confirm that the examples build and are usable.