feat: Add samples for Dutch audio

Author: lpatino10

public/audio/dutch-duo2-mono-NB.wav

@@ -448,5 +448,19 @@
       "keywords": "conscience, esprit de fraternité, libres",
       "speaker_labels": true
     }
+  ],
+  "nl-NL_BroadbandModel": [
+    {
+      "filename": "dutch-duo2-mono.wav",
+      "keywords": "bedankt, informatie, gelegenheid",
+      "speaker_labels": false
+    }
+  ],
+  "nl-NL_NarrowbandModel": [
+    {
+      "filename": "dutch-duo2-mono-NB.wav",
+      "keywords": "bedankt, informatie, gelegenheid",
+      "speaker_labels": true
+    }
   ]
 }