New readme with new build instructions.

README.md

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+WiringPi for OCaml
+==================
+
+A binding for the [WiringPi](http://wiringpi.com/) library for
+[OCaml](http://ocaml.org/).
+
+Build
+-----
+
+You need to have [OASIS](http://oasis.forge.ocamlcore.org/), the best way to
+get it is to use [OPAM](http://opam.ocaml.org/).
+
+```sh
+oasis setup
+ocaml setup.ml -configure
+ocaml setup.ml -build
+```

README.org

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-* Use
-To use it just run
-: make
-and then
-: sudo ./sapin_noel.bin
-
-* Goal
-This script uses the wiringPi library http://wiringpi.com/ (thank you for your job) and adapts it in order to make it usable in Ocaml. Most common functions are implemented (see wiringPiOcaml.ml) but lot's of functions aren't present for the moment. It's very simple to add these functions, so you can add them and if you want I can add your modifications.
-
-There is too a little script to use shift registers, and an example file named sapin_noel.ml.
-
-Enjoy !