Updated Request Matching (markdown)

Request-Matching.md

@@ -26,6 +26,7 @@ At this moment these matchers are supported:
 * [WildcardMatcher](https://github.com/WireMock-Net/WireMock.Net/wiki/Request-Matching#wildcardmatching-wildcardmatcher)
 * ContentTypeMatcher(🚧)
 * [NotNullOrEmptyMatcher](https://github.com/WireMock-Net/WireMock.Net/wiki/Request-Matching#notnulloremptymatcher)
+* [CustomMatcher](https://github.com/WireMock-Net/WireMock.Net/wiki/Request-Matching#CustomMatcher)
 
 ## Exact matcher (ExactMatcher)
 Can be used to exactly match a string or object.
@@ -352,6 +353,31 @@ server
 ### NotNullOrEmptyMatcher
 NotNullOrEmptyMatcher is used for Body matching. This matcher will return a match of the body is not null (BodyAsBytes, BodyAsJson, BodyAsString) or empty (BodyAsBytes, BodyAsString).
 
+### CustomMatcher
+It's also possible to use a custom mapper with your own name.
+
+#### JSON Mapping Option
+``` js
+{
+    "Guid": "67ae335b-5d79-42dc-8ca7-236280ab9211",
+    "Priority": 0,
+    "Request": {
+        "Path": {
+            "Matchers": [
+                {
+                    "Name": "MyCustomMatcher",
+                    "Pattern": "abc"
+                }
+            ]
+        }
+        "Body": {}
+    },
+    "Response": {
+        "Body": "custom match"
+    }
+}
+```
+
 
 ### Reversing the match behaviour with `MatchBehaviour.RejectOnMatch`