Add polly extension to library

src/lib/libraries/extensions/index.js

@@ -30,6 +30,13 @@ export default [
         description: 'Translate text into many languages.',
         featured: true
     },
+    {
+        name: 'Amazon Polly',
+        extensionId: 'speak',
+        iconURL: speechImage,
+        description: 'Make your projects talk.',
+        featured: true
+    },
     {
         name: 'Video Motion',
         extensionId: 'videoSensing',