Merge pull request firmata#170 from gitter-badger/gitter-badge

Add a Gitter chat badge to readme.md

Author: soundanalogous

readme.md

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 #Firmata
 
+[![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/firmata/arduino?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 Firmata is a protocol for communicating with microcontrollers from software on a host computer. The [protocol](https://github.com/firmata/protocol) can be implemented in firmware on any microcontroller architecture as well as software on any host computer software package. The arduino repository described here is a Firmata library for Arduino and Arduino-compatible devices. If you would like to contribute to Firmata, please see the [Contributing](#contributing) section below.
 
 ##Usage