Updated Response Templating (markdown)

Response-Templating.md

@@ -195,4 +195,53 @@ Note that also replacing values in a Json Object and returning a the body as Jso
     }
   }
 }
-```
+```
+
+### XPath support
+XPath support is also present
+
+Three functions are present:
+1. XPath.SelectSingleNode
+2. XPath.SelectNodes
+3. XPath.Evaluate
+
+#### XPath.SelectSingleNode
+This can be used in C# like:
+```csharp
+var server = FluentMockServer.Start();
+server
+    .Given(Request.Create().WithPath("/xpath1").UsingPost())
+    .RespondWith(Response.Create()
+        .WithHeader("Content-Type", "application/xml")
+        .WithBody("<response>{{XPath.SelectSingleNode request.body \"/todo-list/todo-item[1]\"}}</response>")
+        .WithTransformer()
+    );
+```
+
+Or using the admin mapping file:
+``` js
+{
+    "Request": {
+        "Path": {
+            "Matchers": [
+                {
+                    "Name": "WildcardMatcher",
+                    "Pattern": "/xpath1"
+                }
+            ]
+        },
+        "Methods": [
+            "post"
+        ]
+    },
+    "Response": {
+        "Body": "<response>{{XPath.SelectSingleNode request.body \"/todo-list/todo-item[1]\"}}</response>",
+        "UseTransformer": true,
+        "Headers": {
+            "Content-Type": "application/xml"
+        }
+    }
+}
+```
+
+For examples on `XPath.SelectNodes` and `XPath.Evaluate`, see https://github.com/WireMock-Net/WireMock.Net/blob/master/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsXPathTests.cs