TTS/STT languages and voices for each provider (#281)

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* add testcase

lib/utils/speech-data/tts-nvidia.js

@@ -0,0 +1,16 @@
+module.exports = [
+  {
+    value: 'en-US',
+    name: 'English',
+    voices: [
+      {
+        value: 'English-US.Female-1',
+        name: 'Female',
+      },
+      {
+        value: 'English-US.Male-1',
+        name: 'Male',
+      },
+    ],
+  },
+];