Crypto wrap for vigcoin

1. you can have a lot of types

import {
  CNCheckHash,
  CNFashHash,
  CNSlowHash,
  CryptoHash,
  CryptonoteDifficulty,
  CryptoSignature,
  HASH_LENGTH,
  IHash,
  IKey,
  IKeyDerivation,
  IKeyImage,
  IPrivateKey,
  IPublicKey,
  ISignature,
  IsPublicKey,
  NULL_HASH,
  SIGNATURE_LENGTH
} from "../src/types";

2. you can hash a message with fast hash

import { Hash } from "../src/hash";
Hash.from(Buffer.from("Hello world!"))