Add WhiteBit Exchange

Please add WhiteBit Exchange https://whitebit.com/.
API Documentation here: https://github.com/whitebit-exchange/api-docs

Hey! Thanks for the feedback! In ACCOINTING.com, we work based on a voting mechanism: the more upvotes your feature requests has, the faster it moves in our development pipeline. Hopefully, you’ll get enough upvotes from this community to have it implemented. I’m rooting for you!