Investing.com - Cryptocurrencies may be in a bear market, but the free stock-trading app Robinhood is adding two more currencies to its increasingly popular platform.Users will now be able to buy and sell Bitcoin Cash and Litecoin, both top ten cryptos, along with Bitcoin and Ethereum. Robinhood says the move is in response to interest from users.The app launched cryptocurrency trading in February.Robinhood's user base recently topped 5 million, partly because of what the company called "significant momentum" generated by the introduction of crypto trading.