Adding non-ETH Chain support like XinFin[XDC]

[hckhunk]

We have developers looking at this code base. Have a few questions.

1. Is this solution used by BitGo self custody wallets currently?
2. Is there a readme to add non-ETH but eth compatible chain like XinFin[XDC]
3. Are the devs active? if we are to add support?

The only changes that are required are RPC Endpoint :
https://rpc.xinfin.network/

And addresses on XDC network have prefix of "xdc" instead of "0x"

txhash is same obviously