doc/README: convert to reStructuredText

Still a stub, but now it looks better.

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-Unfortunately, there's too much content in this README for me to
-maintain two versions. Please see the canonical README at,
-
-  http://michael.orlitzky.com/code/spline3.php
-

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+Overview
+========
+
+spline3 is a parallel implementation of the 3d interpolation scheme
+described in paper, `Local quasi-interpolation by cubic C\ :sup:`1`
+splines on type-6 tetrahedral partitions
+<https://doi.org/10.1093/imanum/drl014>`_ by Sorokina and
+Zeilfelder. It takes volumetric data as input, and allows you to CSI
+enhance it. The gaps are filled in with interpolated data.
+
+Screenshots and detailed usage info can be found on the `spline3
+homepage <https://michael.orlitzky.com/code/spline3.xhtml>`_.
+
+
+Usage
+=====
+
+.. code-block:: console
+
+  $ spline3 --depth=<depth> --height=<height> --width=<width> <input> <output>
+
+
+Examples
+========
+
+Scaled the example MRI data (included) by the default factor of
+2x. The default depth, width, and height are compatible:
+
+.. code-block:: console
+
+  $ spline3 data/mri.bin output.bin
+
+A 2d slice of that same MRI data, scaled to 8x:
+
+.. code-block:: console
+
+  $ spline3 --slice=50 --scale=8 data/mri.bin out.bmp
+
+
+Requirements
+============
+
+All dependencies are listed in the ``spline3.cabal`` file. Just use
+cabal to build it.
+
+
+Installation
+============
+
+Cabal handles the build, so do whatever you normally do to install
+cabal packages. If you just want to install it for your user,
+
+.. code-block:: console
+
+  $ runghc Setup.hs configure --user
+  $ runghc Setup.hs build
+  $ runghc Setup.hs install
+
+should do it.
+
+
+Bugs
+====
+
+Email them to me at michael@orlitzky.com, or report them on `Codeberg
+<https://codeberg.org/mjo/spline3/issues>`_