add custom token

[drandreaskrueger]

e.g. metamask allows to just input the token contract address, a token name - and then it even pulls the number of digits itself.

please add this functionality.

thanks

[drandreaskrueger]

For now, I have simply used the other wallet for that openethereum/parity-ethereum#11223 (comment) it was enough to give the token contract, and then it pulled name, digits, and balance - by itself.

Thanks.