Microphone support

[flplima]

What would you like to be added:
Integration with Web Speech API

Why is this needed:
It would be really cool if we could talk to Laika using the device's microphone just as it is with most personal assistants.

How to do it

1. Replace the "Send" button in the React app with a microphone button when there is no text entered by the user
2. When clicking on the "Microphone" button, activate the Web Speech API to recognize the device's audio and transform it into text.
3. When you release the "Microphone" button, take the generated text and send it as a text message normally.

Links that can help:

https://www.google.com/intl/en/chrome/demos/speech.html

https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API/Using_the_Web_Speech_API

https://tutorialzine.com/2017/08/converting-from-speech-to-text-with-javascript