Merge pull request #33 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

README.md

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 ofxPiMapper
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+[![Join the chat at https://gitter.im/kr15h/ofxPiMapper](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/kr15h/ofxPiMapper?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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 This project is an attempt to create optimized version of an openFrameworks projection mapping add-on for the Raspberry Pi. It is also my master thesis project at Aalto University, School of Arts, Design and Architecture (Helsinki Media Lab).
 
 ofxPiMapper is mainly for people who want to use the Raspberry Pi as a cheaper way to create standalone mapping installations. Let's say someone has 10 generative mapping pieces and gets an offer to exhibit them in an art gallery, museum or any other kind of place. 10 expensive computers? No! PiMapper is here to save you!