[libchamplain] Add description how to run the python demo

[JiÅÃ Techet <jiritechet src gnome org>]

commit 88dc672b8797834b03d67b962dda2de2d40ad4f1
Author: JiÅÃ Techet <techet gmail com>
Date:   Mon Nov 21 13:16:29 2011 +0100

    Add description how to run the python demo

 demos/minimal.py |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/demos/minimal.py b/demos/minimal.py
index 9c7fef4..6be224e 100755
--- a/demos/minimal.py
+++ b/demos/minimal.py
@@ -1,5 +1,10 @@
 #!/usr/bin/env python
 
+# To run this example, you need to set the GI_TYPELIB_PATH environment
+# variable to point to the gir directory:
+#
+# export GI_TYPELIB_PATH=$GI_TYPELIB_PATH:/usr/local/lib/girepository-1.0/
+
 from gi.repository import GtkClutter
 GtkClutter.init([])
 from gi.repository import GObject, Gtk, GtkChamplain