Initial support for converting the mappings to a Pact(flow) json file (#748)

* WithDescription

* WithConsumer / WithProvider

* x

* .

* .

* .

* .

* fix

* pact

* nullable

* ficx

* .

* fix

src/WireMock.Net/Server/IRespondWithAProvider.cs

@@ -38,6 +38,13 @@ namespace WireMock.Server
         /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
         IRespondWithAProvider WithTitle(string title);
 
+        /// <summary>
+        /// Define a description for this mapping.
+        /// </summary>
+        /// <param name="description">The description.</param>
+        /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
+        IRespondWithAProvider WithDescription(string description);
+
         /// <summary>
         /// Define the full filepath for this mapping.
         /// </summary>