Add pulsechain buy optio

Description: Enable pulsechain/pls token buys via MM

Purpose: Pulsechain is very popular and has strong community and significant liquidity. You currently cannot easily buy this coin via MetaMask, what is needed to enable this?

Thank you very much - your help is appreciated!!

To clarify it needs to be easier to buy $PLS with cash in MM, like how this is already possible for Ethereum