edited the readme.md

README.md

@@ -1,4 +1,34 @@
-shamir
-======
+#  shamir
+
+Presentation slides about 3 articles from Adi Shamir: visual cryptography, secret
+sharing and zero knowledge proofs.
+
+### the presentation
+
+the presentation is about three cryptographic articles Adi Shamir has written.  The audiance
+is not expected to have any cryptographic knowledge before attending the presentation.  The
+three articles are absolutly not releated one with each other.  The three subjects are
+*  visual cryptography
+*  secret sharing
+*  zero knowledge proofs
+
+### technicalities
+
+The presentation is made with the [ipython notebook](http://ipython.org/notebook.html) using
+[numpy](http://www.numpy.org/) and [matplotlib](http://matplotlib.org/).  The presentation
+itself is rendered using [reveal.js](http://lab.hakim.se/reveal-js/).
+
+
+#### stating the presentation
+
+`make serve` should work!  Then you will need to browse to
+http://localhost:2000/cryptographie_visuelle.slides.html to see the presentation
+in a web browser.
+
+#### hacking the presentation
+
+`make env` should allow you to set up your dev environment on mac and linux.  Note
+that you will need python 3, pip, virtualenv and all the binaries required to
+`pip install` numpy and matplotlib.
+
 
-Presentation slides about 3 articles from Adi Shamir: visual cryptography, secret sharing and zero knowledge proofs