Added a README and a sample image

README.md

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+PIXELTERM
+=========
+An utility to render pixely images on your terminal!
+
+![example](http://i.imgur.com/WqgsQ62.png)
+
+Installation
+------------
+Type ```sudo make install```, which will copy pixelterm.py to ```/usr/local/bin/pixelterm```.
+
+Usage
+-----
+```pixelterm FILE```
+
+Advanced usage
+--------------
+Since I wrote this tool to generate graphics for
+[ponysay](https://github.com/jaseg/ponysay), I included a "speech bubble"
+feature. To make this tool render speech bubble markers which can later be
+parsed by ponysay, color the pixels where these should be placed 50%
+transparent red (#FF00007F) for a backward slash link, 50% blue for a forward
+slash and a 50% transparent green for the speech bubble. Please note that this
+tool converts images two pixel rows at once and these "special" color values
+are only parsed for the upper of the two rows. An example image is included.
+
+Credits
+-------
+That awesome Rainbow Dash is by [starsteppony on deviantart](http://starsteppony.deviantart.com/art/Rainbow-Dash-Salute-263753912)
+