DOC: Added README.md

Following the docs at http://www.openfoam.org/contrib/unsupported.php.
Merge pull request #1 from themiwi/patches/proposed/README

DOC: Added README.md
Merge branch 'master' of git://github.com/Unsupported-Contrib-OpenFOAM/Unsupported-Contrib-OpenFOAM-2.1.x