Add Install instructions to INSTALL.md

[elstamey]

Documenting my current errors. I know I need to create a database:

Warning: include(/var/www/html/combell/wp-config-local.php): failed to open stream: No such file or directory in /var/www/html/combell/wp-config.php on line 26

Warning: include(): Failed opening '/var/www/html/combell/wp-config-local.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/combell/wp-config.php on line 26

Warning: mysqli_real_connect(): (HY000/2002): Connection refused in /var/www/html/combell/wordpress/wp-includes/wp-db.php on line 1487

Warning: mysql_connect(): Connection refused in /var/www/html/combell/wordpress/wp-includes/wp-db.php on line 1513
Error establishing a database connection

[elstamey]

We are going to try to incorporate VVV so that contributors can install and configure the site quickly.

[elstamey]

This will be assigned to @damko as soon as we can get the permissions set up