Added esgemme logo to the README.md.

README.md

 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
+![image info](./images/esgemme-image.png)
 # ESGEMME: Evolutionary and Structural Global Epistatic Model for Mutational Effects                                                                                                             
 
 ## Introduction