Add of the app running script

In order to launch the app, I create this script. It just launch the
Django internal HTTP server on the port 4000 (later on, it should
handled by Gunicorn or any WSGI server).
Then I launch the nginx server.

Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/setup/dk/run-allgo

+#!/bin/sh
+
+set -e
+
+# exec nginx -g 'daemon off;'
+python3 /opt/allgo/manage.py runserver 4000 &
+service nginx start