[Feature Request] Adding exchange API support

[B1gB1rd1400]

A feature request that I have is to add support for the major exchanges, Binance, GDAX, etc with API support for importing balances and or transactions.

[LesterCovax]

This has been brought up before, when someone gave mercuryapp.io as an example. I looked into the library that they use and I don't think it's feasible with google sheets since the closest implementation that would work is using node.js.

• https://mercuryapp.io/settings
• https://github.com/ccxt/ccxt

That means a lot of extra API work, and potential implications. The script is already pushing the limits of run time / API calls, so I imagine adding this functionality would make that even worse. Definitely not against it though.