An OpenApi (swagger) parser to generate MappingModel or mapping.json file (#479)

* wip

* .

* .

* nuget

* .

* .

* WithMappingModel

* tests

* json

* codefactor

* sign

* .

* interface

* sln

* comments

examples/WireMock.Net.OpenApiParser.ConsoleApp/Program.cs

@@ -0,0 +1,35 @@
+using Microsoft.OpenApi.Readers;
+using Newtonsoft.Json;
+using System;
+using System.IO;
+
+namespace WireMock.Net.OpenApiParser.ConsoleApp
+{
+    class Program
+    {
+        private static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
+        {
+            NullValueHandling = NullValueHandling.Ignore,
+            Formatting = Formatting.Indented
+        };
+
+        static void Main(string[] args)
+        {
+            Run.RunServer("petstore-openapi3.json");
+
+            //IWireMockOpenApiParser parser = new WireMockOpenApiParser();
+
+            //var petStoreModels = parser.FromStream(File.OpenRead("petstore-openapi3.json"), out OpenApiDiagnostic diagnostic1);
+            //string petStoreJson = JsonConvert.SerializeObject(petStoreModels, Settings);
+            // File.WriteAllText("../../../wiremock-petstore-openapi3.json", petStoreJson);
+
+            //Run.RunServer(petStoreModels);
+
+            //var mappingModels2 = parser.FromStream(File.OpenRead("infura.yaml"), out OpenApiDiagnostic diagnostic2);
+            //Console.WriteLine(JsonConvert.SerializeObject(diagnostic2, Settings));
+
+            //string json2 = JsonConvert.SerializeObject(mappingModels2, Settings);
+            //Console.WriteLine(json2);
+        }
+    }
+}