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

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* add testcase

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

@@ -0,0 +1,58 @@
+module.exports = [
+  {
+    name: 'Arabic',
+    value: 'ar-AR',
+  },
+  {
+    name: 'English',
+    value: 'en-US',
+  },
+  {
+    name: 'English - GB',
+    value: 'en-GB',
+  },
+  {
+    name: 'Spanish - US',
+    value: 'es-US',
+  },
+  {
+    name: 'Spanish',
+    value: 'es-ES',
+  },
+  {
+    name: 'German',
+    value: 'de-DE',
+  },
+  {
+    name: 'French',
+    value: 'fr-FR',
+  },
+  {
+    name: 'Hindi',
+    value: 'hi-IN',
+  },
+  {
+    name: 'Russian',
+    value: 'ru-RU',
+  },
+  {
+    name: 'Korean',
+    value: 'ko-KR',
+  },
+  {
+    name: 'Brazilian-Portuguese',
+    value: 'pt-BR',
+  },
+  {
+    name: 'Japanese',
+    value: 'ja-JP',
+  },
+  {
+    name: 'Italian',
+    value: 'it-IT',
+  },
+  {
+    name: 'Mandarin',
+    value: 'zh-CN',
+  },
+];