Convert README to markdown

I also added a link to the IPython gallery.

Author: agarie

README.md

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+# SciRuby example notebooks
+
+This repository will in the future include a bunch of notebooks showing the
+functionality of iruby and scientific ruby gems.
+
+Furthermore there will be a Dockerfile which allows the creation of a Docker
+container with everything preinstalled what is needed.
+
+A lot of Python examples can be found at [the IPython
+Gallery](https://github.com/ipython/ipython/wiki/A-gallery-of-interesting-IPython-Notebooks).