merge netstandard into main (#26)

* #23

* #23 "Newtonsoft.Json" Version="10.0.2"

* owin

* AspNetCore

* Fix appveyor build

* fix start/stop in untitests

examples/WireMock.Net.ConsoleApplication/Program.cs

@@ -97,6 +97,7 @@ namespace WireMock.Net.ConsoleApplication
 
             Console.WriteLine("Press any key to stop the server");
             Console.ReadKey();
+            server.Stop();
 
             Console.WriteLine("Displaying all requests");
             var allRequests = server.LogEntries;