This particular token is representative of a platform called Liquid.plus that aims to add more liquidity to the cryptocurrency market. Their startup is looking to help underserved locations such as India or South American countries to help give them more access to crypto financial markets.
This problem is often overlooked, but they're prepared to be a pioneer in this space by enabling globally sourced trading opportunities by way of their "World Book." Your Qash investment will offer you the ability to use your tokens on the platform instead of just holding them in the hopes of them gaining in value.
You can buy Qash on a few different exchanges, but it's strangely absent from all of the big players currently. Most likely this is because this token belongs to parent company Quoine, and they want to push you to purchase on their exchange. They do offer trading pairs in both BTC and multiple fiat pairings such as USD, JPY, SGD, and IDR should you wish to make a purchase that way through which is nice.
Storing your tokens is a little strange. While this coin originated as an ERC20 token for the crowd sale it will eventually be transferred to its own blockchain. When that happens you'll need to look to the developers for information on swapping your ERC20 tokens for the new chain's token. Until that time though you can store them in any Ethereum based wallet such as My Ether Wallet or a Ledger Hardware wallet should you have one available.