Generate C# code from Mapping (#842)

* 1

* .

* v

* .

* .

* -

* b

* res b

* Fix UT

* .

* Verify

* v

* ...

* .

* .

* dir

* m

test/WireMock.Net.Tests/.filenesting.json

@@ -0,0 +1,18 @@
+{
+    "help": "https://go.microsoft.com/fwlink/?linkid=866610",
+    "root": true,
+
+    "dependentFileProviders": {
+        "add": {
+            "addedExtension": {},
+            "pathSegment": {},
+            "fileSuffixToExtension": {
+                "add": {
+                    ".verified.txt": [
+                        ".cs"
+                    ]
+                }
+            }
+        }
+    }
+}