code: function createMultisignature (secret, secondSecret, keysgroup, lifetime, min) {
  	var keys = crypto.getKeys(secret);
  
  	var keygroupFees = keysgroup.length + 1;
  
  	var transaction = {
  		type: 4,
  		amount: 0,
  		fee: (constants.fees.multisignature * keygroupFees),
  		recipientId: null,
  		senderPublicKey: keys.publicKey,
  		timestamp: slots.getTime(),
  		asset: {
  			multisignature: {
  				min: min,
  				lifetime: lifetime,
  				keysgroup: keysgroup
  			}
  		}
  	};
  
  	crypto.sign(transaction, keys);
  
  	if (secondSecret) {
  		var secondKeys = crypto.getKeys(secondSecret);
  		crypto.secondSign(transaction, secondKeys);
  	}
  
  	transaction.id = crypto.getId(transaction);
  	return transaction;
  }
docs: @method createMultisignature
  @param secret string
  @param secondSecret string
  @param keysgroup array
  @param lifetime number
  @param min number
  
  @return {Object}