Sync.

To test it's handy to run a virtual hosted CyDefSIG having it's own
database besides an already existing CyDefSIG.
This is the Apache virtual host setup.

app/README.vhost.txt

@@ -0,0 +1,26 @@
+VIRTUAL HOST INSTRUCTION
+------------------------
+
+CyDefSIG is able to run in an Apache virtual host setup.
+This takes 2 variables, the hostname and CyDefSIG directory.
+To this one must enter the hostname in /etc/hosts
+and create an Apache config in apache2/sites-available.
+
+Say we have a hostname cydefsig2.local.net and
+CyDefSIG installed in /var/www/second_instance/cydefsig,
+we will add to /etc/hosts:
+
+127.0.1.1       cydefsig2.local.net
+
+And create a file /etc/apache2/sites-available/<second_instance_name>
+containing:
+
+<VirtualHost *:80>
+        ServerAdmin webmaster@example.com
+        ServerName  cydefsig2.local.net
+        ServerAlias mysite
+
+        # Indexes + Directory Root.
+        DirectoryIndex index.php
+        DocumentRoot /var/www/second_instance/cydefsig
+</VirtualHost>