add README.markdown [ci skip]

README.markdown

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+[![Build Status](https://secure.travis-ci.org/diagrams/diagrams-povray.png)](http://travis-ci.org/diagrams/diagrams-povray)
+
+A rendering backend for three-dimensional
+[diagrams](http://projects.haskell.org/diagrams) generating
+[POV-Ray](http://www.povray.org/) scene descriptions.  Currently, it
+is not much more than a skeletal proof of concept, and is waiting for
+an interested party to come along and flesh it out!