Updated Admin API Reference (markdown)

Admin-API-Reference.md

@@ -189,6 +189,24 @@ Example request:
   }
 ```
 
+Create a new stub mapping and save this to disk. Example request:
+```js
+{
+    "Guid": "dae02a0d-8a33-46ed-aab0-afbecc864344",
+    "SaveToFile": true,
+    "Title": "the_filename",
+    "Request": {
+      "Url": "/example",
+      "Methods": [
+        "get"
+      ]
+    },
+    "Response": {
+      "BodyAsJson": { "result": "ok" }
+    }
+  }
+```
+
 _Note_ : It's also possible to pre-load Mappings. This can be done by putting a file named `{guid}.json` in the `__admin\mapping` directory.
 
 Example : `11111110-a633-40e8-a244-5cb80bc0ab66.json`