Add all files needed to bring up VM and run agaric.com locally

box/docs/configurations/databases-mariadb.md

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+Since Drupal VM is built in a modular fashion, and the upstream Ansible Role that installs and configures MySQL is built in a way that works with any MySQL-compatible replacement, you can easily swap out MySQL for MariaDB.
+
+The simplest way is to add the following lines after the `# MySQL Configuration.` line in `config.yml`:
+
+```yaml
+mysql_packages:
+  - mariadb-client
+  - mariadb-server
+  - python-mysqldb
+```
+
+This set of packages works out of the box with Ubuntu 14.04 as well as the default Ubuntu 16.04 installation that comes with Drupal VM.
+
+Alternatively, if you want to use RedHat 7 or CentOS 7 instead of Ubuntu, you can set the following variables to install and configure MariaDB instead of MySQL:
+
+```yaml
+mysql_packages:
+  - mariadb
+  - mariadb-server
+  - mariadb-libs
+  - MySQL-python
+  - perl-DBD-MySQL
+mysql_daemon: mariadb
+mysql_socket: /var/lib/mysql/mysql.sock
+mysql_log_error: /var/log/mariadb/mariadb.log
+mysql_syslog_tag: mariadb
+mysql_pid_file: /var/run/mariadb/mariadb.pid
+```