Updated Admin API Reference (markdown)

Admin-API-Reference.md

@@ -25,6 +25,25 @@ api.Authorization = new AuthenticationHeaderValue("Bearer", "eyJ0eXAiOiJKV1QiLCJ
 var settings = await api.GetSettingsAsync();
 ```
 
+### FluentBuilder
+All Admin API Model classes are annotated with [FluentBuilder](https://github.com/StefH/FluentBuilder) which makes it easy to build a mapping in a fluent way.
+
+Example code:
+``` c#
+var mappingBuilder = api.GetMappingBuilder();
+    mappingBuilder.Given(m => m
+        .WithTitle("This is my title 1")
+        .WithRequest(req => req
+            .UsingGet()
+            .WithPath("/bla1")
+        )
+        .WithResponse(rsp => rsp
+            .WithBody("x1")
+            .WithHeaders(h => h.Add("h1", "v1"))
+        )
+    );
+```
+
 ## Supported interfaces
 The following interfaces are supported: