Immutable X orders C# client

A c# client for immutable exchange. It allows for communication with the exchange (creating and cancelling orders) - you can reuse this code to save time.

Using the client

In class OfferClient:

1. Fill the _ethPublicAddress with your etherum public key. It can be seen in Metamask, at the top of the default window.
2. Fill the _ethSecret and _starkSecret with your private keys. Your etherum private key can be found with Metamask in your browser.
3. This library (https://www.immutabletools.online/) is used as an implementation to ISigner to sign messages with the defined private keys. It is required by Immutable X exchange.
4. [Optional] Update the ICommunicationClient implementation with a custom one, if needed