i know how to generate the seed phrase etc with the js bip39 library after that im a bit stuck.
this is basically what i am attempting so far:
const mnemonic = "vacant element sleep harsh stick else salt great kitten clutch salad subway"
const privateKey = new Buffer( mnemonic )
const publicKey = ethUtil.privateToPublic(privateKey).toString('hex')
const address = ethUtil.privateToAddress(privateKey).toString('hex')