Adnuntius bid adapter: Adding example of how to request native ad.

dev-docs/bidders/adnuntius.md

@@ -5,7 +5,7 @@ description: Prebid Adnuntius Bidder Adaptor
 pbjs: true
 pbs: true
 biddercode: adnuntius
-media_types: banner, video
+media_types: banner, video, native
 gdpr_supported: true
 fpd_supported: true
 gvl_id: 855
@@ -166,3 +166,34 @@ Currently we only support client requests and instream context. An example reque
 };
 ```
 
+#### Example native
+
+Here's an example of how to request a native ad from adnuntius:
+
+```
+{
+    code: 'native',
+    sizes: [
+        [320, 320]
+    ],
+    mediaTypes: {
+        native: {
+            title: {
+                required: true
+            },
+            image: {
+                required: true
+            },
+            body: {
+                required: true
+            }
+        }
+    },
+    bids: [{
+        bidder: 'adnuntius',
+        params: {
+            auId: "0000000000abc123",
+        }
+    }]
+}
+```