Added readme.

README.md

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+# imcat
+
+Show any size image in a terminal window. No X11 required.
+
+
+![Sample use](images/sampledesktop.png "Sample use.")
+
+## Introduction
+
+Do you ever find yourself logged into a server, over SSH, but there is no X11 connection.
+And you want to see the contents of an image?
+
+imcat to the rescue!
+
+imcat is a 24-bit image viewer that uses ANSI terminal colours to display any image supported by STB.
+It automatically resizes to the width of your terminal, using proper sampling kernels.
+
+## To do
+* Correct for aspect ratio of terminal font.
+
+## License
+
+* Public Domain.
+
+## Authors
+
+[Bram Stolk](http://stolk.org).
+
+[stb_image.h](http://nothings.org/stb_image.h) is by Sean Barrett et al.
+
+