Usage:

```rust

extern crate huffman_rs;

fn main() {

let mut encoder = HuffmanEncoder::new();
let mut ascii_bytes: Vec<u8> = vec![];
for i in 0..256 {
    ascii_bytes.push(i as u8);
}

let encoded_bytes: Vec<u8> = encoder.encode(ascii_bytes);
println!("{:?}", encoded_bytes);
let mut decoder = HuffmanDecoder::new();
let decoded_bytes = decoder.decode(encoded_bytes).unwrap();

println!("{:?}", decoded_bytes);

}

```