Add a brief README.

Signed-off-by: Evan Broder <broder@mit.edu>

diff --git a/README b/README
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+================
+Installing PyAFS
+================
+
+To install PyAFS, you will first need to install Cython_, which you
+can do by running:
+
+  $ easy_install Cython
+
+Once you've done that, to install PyAFS globally, run
+
+  $ python setup.py install
+
+If you want to build PyAFS without installing it globally, you may
+want to run:
+
+  $ python setup.py build_ext --inplace
+
+which will build the C extensions in place next to their source,
+allowing you to import the various modules, so long as your current
+working directory is the root of the PyAFS source tree.
+
+.. _Cython: http://cython.org/