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

box/docs/extras/ruby.md

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+Ruby is used for many different purposes, but with Drupal, it is most often used as part of a toolset for Front End development or certain CI tasks.
+
+Drupal VM includes built-in support for Ruby—all you need to do is make sure `ruby` is listed in the list of `installed_extras` inside `config.yml` before your provision Drupal VM.
+
+## Installing gems
+
+To install ruby gems, you can add them to the list of `ruby_install_gems` in `config.yml`.
+
+```yaml
+ruby_install_gems:
+  - sass
+  - compass
+```
+
+For a list of available role variables, see the [`geerlingguy.ruby` Ansible role's README](https://github.com/geerlingguy/ansible-role-ruby#readme).