.Net client library is being ported to .Net Standard 2.0 target. An early version is available here dotnetkiteconnect/netstandard. There is no change in the APIs.
Builds are currently verified only in Linux. If you would like to test it out, clone repo and add KiteConnect project to your .Net Core or .Net Framework projects. If you find any bugs create an issue here dotnetkiteconnect/issues.