Add additional currencies

[markus-renezeder]

Please add the possibility to add aditional currencies (e.g. ICP)

[ismaelestalayo]

Please add the possibility to add aditional currencies (e.g. ICP)

So far in my WIP 6.0 update I've added a few new currencies like ARS, BRL or PLN and also cryptocurrencies like BTC and ETH (you can check them here).

However, I can only add currrencies which the APIs I use support and unfortunately I dont see ICP either in CoinGecko's or CryptoCompare's APIs.