Created Webhook (markdown)

Webhook.md

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+It's also possible to define a Webhook for a mapping. 
+
+With this you can send request to a specific URL after serving mocked response to a request.
+
+Note that [transformations/templating](https://github.com/WireMock-Net/WireMock.Net/wiki/Response-Templating) is also supported for the `request` and `response` objects.
+
+# Examples
+### C#
+This is configurable in code:
+``` c#
+// Option 1
+var server = WireMockServer.Start();
+server.Given(Request.Create().UsingPost())
+    .WithWebhook(new Webhook
+    {
+        Request = new WebhookRequest
+        {
+            Url = "https://any-endpoint.com",
+            Method = "post",
+            BodyData = new BodyData
+            {
+                BodyAsString = "OK !",
+                DetectedBodyType = BodyType.String
+            }
+        }
+    })
+    .RespondWith(Response.Create().WithBody("a-response"));
+
+// Option 2
+var server2 = WireMockServer.Start();
+    server2.Given(Request.Create().UsingPost())
+        .WithWebhook("https://any-endpoint.com", "post", null, "OK !", true, TransformerType.Handlebars)
+        .RespondWith(Response.Create().WithBody("a-response"));
+```
+
+### JSON
+Or via posting this mapping:
+``` json
+{
+    "Guid": "755384f9-2252-433d-ae8b-445b9f1cc729",
+    "Priority": 0,
+    "Request": {
+        "Path": {
+            "Matchers": [
+                {
+                    "Name": "WildcardMatcher",
+                    "Pattern": "/wh"
+                }
+            ]
+        },
+        "Methods": [
+            "POST"
+        ]
+    },
+    "Response": {
+        "Body": "<xml>ok</xml>",
+        "Headers": {
+            "Content-Type": "application/xml"
+        }
+    },
+    "Webhook": {
+        "Request": {
+            "Url": "http://{{wm_hostname}}/post",
+            "Method": "POST",
+            "Headers": {
+                "x": "x-value"
+            },
+            "Body": "ok - RequestPath used = {{request.path}}",
+            "UseTransformer": true
+        }
+    }
+}
+```
+