Add a readme with a link to the benchmarks

README.rst

+sumpy: n-body kernels and translation operators
+===============================================
+
+.. image:: https://gitlab.tiker.net/inducer/sumpy/badges/master/pipeline.svg
+   :target: https://gitlab.tiker.net/inducer/sumpy/commits/master
+.. image:: https://badge.fury.io/py/sumpy.png
+    :target: http://pypi.python.org/pypi/sumpy
+
+Sumpy is mainly a 'scaffolding' package for Fast Multipole and quadrature methods.
+If you're building one of those and need code generation for the required Multipole
+and local expansions, come right on in. Together with boxtree, there is a full,
+symbolically kernel-independent FMM implementation here.
+
+Sumpy relies on
+
+* `numpy <http://pypi.python.org/pypi/numpy>`_ for arrays
+* `boxtree <http://pypi.python.org/pypi/boxtree>`_ for FMM tree building
+* `sumpy <http://pypi.python.org/pypi/sumpy>`_ for expansions and analytical routines
+* `loopy <http://pypi.python.org/pypi/loo.py>`_ for fast array operations
+* `pytest <http://pypi.python.org/pypi/pytest>`_ for automated testing
+
+and, indirectly,
+
+* `PyOpenCL <http://pypi.python.org/pypi/pyopencl>`_ as computational infrastructure
+
+PyOpenCL is likely the only package you'll have to install
+by hand, all the others will be installed automatically.
+
+Resources:
+
+* `documentation <http://documen.tician.de/sumpy>`_
+* `source code via git <http://github.com/inducer/sumpy>`_
+
+If you can see inside the UIUC firewall, you may browse
+`benchmark results <http://koelsch.cs.illinois.edu/benchmarks/asv/sumpy/>`_.
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