Update README.md

Author: FredericJacobs

README.md

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 Axolotl Kit is a free implementation of the Axolotl protocol
 
+![AxolotlKit](http://cl.ly/WYR4/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f373635392f323131353834382f36303637346365322d393035632d313165332d396233622d6634663830613766363533342e706e67.png)
+
 ## Roadmap 
 
 The goal of this first implementation of AxolotlKit is to have a storage-agnostic library written in Objective-C of the [Axolotl ratchet](https://github.com/trevp/axolotl/wiki). Only features of Axolotl used in the TextSecure protocol will be implemented in this initial release (header keys used in Pond won't be part of this implementation).
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 ## Release
 
 AxolotlKit is going to be released as a CocoaPod as soon as it's considered stable and has gotten enough peer-review.
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+## Credit
+
+Thanks to [Conor Heelan](http://www.conorheelan.com/) for the Axolotl illustration.