new: [README.org] add information about how to access odoo

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

README.org

@@ -137,6 +137,13 @@ odoo:
   #    options:
   #      email_from: me@example.com
 
+  ## Create a direct access from 0.0.0.0:80
+  relations:
+    web-proxy:
+      apache:
+        ## be sure to add the following domain to your /etc/hosts
+        domain: odoo
+
 EOF
 #+END_SRC
 
@@ -146,6 +153,42 @@ You can then launch the service(s) with:
 compose up
 #+END_SRC
 
+**** Access odoo from your browser
+
+You should access your odoo through the web-proxy, but if this is not
+what you want, you can access it directly.
+
+***** Using the web-proxy to access odoo
+
+You'll need to modify your =/etc/hosts= to include the domain name 'odoo'
+as a domain name for =127.0.0.1=.
+
+#+BEGIN_SRC shell
+cat <<EOF | sudo tee -a /etc/hosts
+127.0.0.1 odoo
+EOF
+#+END_SRC
+
+This will ask for your password as it need write access to =/etc/hosts=.
+
+You can then use =http://odoo= to access your odoo instance.
+
+***** Direct connection to odoo container
+
+You should be able to point your browser to the ip of the odoo
+container. You can find this IP using =docker-ip=.
+
+If you are lazy, this might work:
+
+#+BEGIN_SRC shell
+ODOO_IP=$(docker-ip | grep odoo | sed -r 's/ +/ /g' | cut -f 3 -d " ")
+echo "Odoo is up and running on: http://$ODOO_IP:8069"
+#+END_SRC
+
+If your setup allow direct access from the host running your browser
+to the container's network, then you can point your browser towards
+the given address.
+
 
 *** using =docker-compose=