added an url about scientific python in resource

Author: xms0g

docs/scenarios/scientific.rst

@@ -68,3 +68,7 @@ scientific computing packages are notoriously difficult to build and install.
 compiled a list of Windows binaries for many useful Python packages. The list
 of packages has grown from a mainly scientific python resource to a more
 general list. It might be a good idea to check it out if you're on Windows.
+
+For a quick introduction to scientific python:
+
+`Scientific Python Lectures < http://scipy-lectures.github.com/>`_