Margin Trading on Binance Support is missing

[vburwitz3]

Issue Overview

Binance introduces Margin trading. Sadly these go over totally new REST commands. Therefore they are not possible with the existing BinanceDotNet.
It would be urgently necessary to extend BinanceDotNet to include the new REST commands to be able to actually use Margin functionality. Without a extention is is definately sadly absolutely not possible to use it over the API with C#.

Package Version: ?.?.?

Repro Steps

Just try to use Margin functionality of Binance it is definately absolutely not possible.

Other Information

Check out the Binance REST documentation for Margin Trading:
https://github.com/binance-exchange/binance-official-api-docs/blob/master/margin-api.md
Definetly all new commands that need to be supported in a new BinanceDotNet version.