Create Speech_synthesis.md

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snippets/Speech_synthesis.md

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+### Speech synthesis
+
+Currently The SpeechSynthesisUtterance interface of the Web Speech API represents a speech request. 
+It contains the content the speech service should read and information about how to read it (e.g. language, pitch and volume.)
+
+To know more - https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance
+
+```
+function speak (message) {
+  var msg = new SpeechSynthesisUtterance(message)
+  var voices = window.speechSynthesis.getVoices()
+  msg.voice = voices[0]
+  window.speechSynthesis.speak(msg)
+}
+speak('Hello, world')
+```