create method
Implementation
static Future<Account> create(String pwd,
{PrivateKey prikey, String label, ScryptParams params}) async {
prikey = prikey ?? await PrivateKey.random();
label = label ?? await randomLabel();
var salt = (await Buffer.random(4)).bytes;
var pubkey = await prikey.getPublicKey();
var addr = await Address.fromPubkey(pubkey);
var enc = await prikey.encrypt(Convert.strToBytes(pwd), addr, salt,
params: params);
return Account(label, await addr.toBase58(), false, enc,
Convert.bytesToBase64(salt), pubkey.hexEncoded, false);
}