Add logo to README.

README.md

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 [![Build Status](https://secure.travis-ci.org/louismullie/treat.png)](http://travis-ci.org/#!/louismullie/treat)
 [![Code Climate](https://codeclimate.com/badge.png)](https://codeclimate.com/github/louismullie/treat)
 
+![Treat Logo](http://www.louismullie.com/treat/treat-logo.jpg)
+
 Treat is a toolkit for natural language processing and computational linguistics in Ruby. The Treat project aims to build a language- and algorithm- agnostic NLP framework for Ruby with support for tasks such as document retrieval, text chunking, segmentation and tokenization, natural language parsing, part-of-speech tagging, keyword extraction and named entity recognition. Learn more by taking a [quick tour](https://github.com/louismullie/treat/wiki/Quick-Tour) or by reading the [manual](https://github.com/louismullie/treat/wiki/Manual).
 
 **Features**