Updated readme for installation

README.md

@@ -6,3 +6,10 @@ IRC bot in python, used to help for press review of La Quadrature du Net
 License: AGPLv3
 Source : http://git.laquadrature.net/rp/wantzel
 
+
+Installation
+~~~~~~~~~~~~
+
+Clone the repository, then create a virtualenv with a python2.7 interpreter.
+Install the requirements and launch it using wantzel.py.
+