added logo

README.md

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 [![Build Status](https://travis-ci.org/fermiumlabs/mathlion.svg?branch=master)](https://travis-ci.org/fermiumlabs/mathlion) [![Code Climate](https://codeclimate.com/github/fermiumlabs/mathlion/badges/gpa.svg)](https://codeclimate.com/github/fermiumlabs/mathlion) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/e3dffaf9691048cc926cc80721b8750e)](https://www.codacy.com/app/d_2/mathlion?utm_source=github.com&utm_medium=referral&utm_content=fermiumlabs/mathlion&utm_campaign=Badge_Grade) [![Analytics](https://ga-beacon.appspot.com/UA-69533556-3/mathlion/readme/?flat)](https://github.com/igrigorik/ga-beacon)
 
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+![logo](logo.png)
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 # Mathlion
 
 [![Join the chat at https://gitter.im/fermiumlabs/mathlion](https://badges.gitter.im/fermiumlabs/mathlion.svg)](https://gitter.im/fermiumlabs/mathlion?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)