add TTS MOS figure to readme

README.md

@@ -7,6 +7,11 @@ TTS includes two different model implementations which are based on [Tacotron](h
 
 If you are new, you can also find [here](http://www.erogol.com/text-speech-deep-learning-architectures/) a brief post about TTS architectures and their comparisons.
 
+## TTS Performance 
+<p align="center"><img src="https://raw.githubusercontent.com/mozilla/TTS/master/assets/tacotron_wavernn.png"/></p>
+
+[More Details...](https://github.com/mozilla/TTS/issues/186)
+
 ## Requirements and Installation
 Highly recommended to use [miniconda](https://conda.io/miniconda.html) for easier installation.
   * python>=3.6