add README

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

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+isl is a thread-safe C library for manipulating sets and relations
+of integer points bounded by affine constraints.  The descriptions of
+the sets and relations may involve both parameters and existentially
+quantified variables.  All computations are performed in exact integer
+arithmetic using GMP.
+
+isl is released under the MIT license, but depends on the LGPL GMP
+library.
+
+Minimal compilation instructions:
+
+       ./configure
+       make
+       make install
+
+If you are taking the source from the git repository, then you first
+need to do
+
+       git clone git://repo.or.cz/isl.git
+       ./autogen.sh
+
+For more information, see doc/user.pod or the generated documentation.
+
+New releases are announced on http://freecode.com/projects/isl
+
+If you use isl, you can let me know by stacking
+https://www.ohloh.net/p/isl on ohloh.
+
+For bug reports, feature requests and questions,
+contact http://groups.google.com/group/isl-development
+
+If you use isl for your research, you are invited do cite
+the following paper and/or the paper(s) describing the specific
+operations you use.
+
+@incollection{Verdoolaege2010isl,
+   author = {Verdoolaege, Sven},
+   title = {isl: An Integer Set Library for the Polyhedral Model},
+   booktitle = {Mathematical Software - ICMS 2010},
+   series = {Lecture Notes in Computer Science},
+   editor = {Fukuda, Komei and Hoeven, Joris and Joswig, Michael and
+               Takayama, Nobuki},
+   publisher = {Springer},
+   isbn = {978-3-642-15581-9},
+   pages = {299-302},
+   volume = {6327},
+   year = {2010}
+}