Docs about base boxes

BOXES.md

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+# vagrant-lxc base boxes
+
+Although the official documentation says it is only supported for VirtualBox
+environments, you can use the [`vagrant package`](http://docs.vagrantup.com/v2/cli/package.html)
+command to export a `.box` file from an existing vagrant-lxc container.
+
+There is also a set of [bash scripts](https://github.com/fgrehm/vagrant-lxc/tree/master/boxes)
+that you can use to build base boxes as needed. By default it won't include any
+provisioning tool and you can pick the ones you want by providing some environment
+variables.
+
+For example:
+
+```
+git clone https://github.com/fgrehm/vagrant-lxc.git
+cd vagrant-lxc/boxes
+PUPPET=1 CHEF=1 sudo -E ./build-ubuntu-box.sh precise amd64
+```
+
+Will build a Ubuntu Precise x86_64 box with latest Puppet and Chef pre-installed, please refer to the scripts for more information.
+
+## "Anatomy" of a box
+
+If you need to go deeper and build your scripts from scratch or if you are interested
+on knowing what makes a base box for vagrant-lxc, here's what's needed:
+
+### Expected `.box` contents
+
+| FILE            | DESCRIPTION |
+| ---             | ---         |
+| `lxc-template`  | Script responsible for creating and setting up the container (used with `lxc-create`), a ["generic script"]() is provided along with project's source. |
+| `rootfs.tar.gz` | Compressed container rootfs tarball (need to remeber to pass in `--numeric-owner` when creating it) |
+| `lxc.conf`      | |
+| `metadata.json` | |
+
+### metadata.json
+
+```json
+{
+  "provider": "lxc",
+  "version":  "3",
+  "built-on": "Sat Sep 21 21:10:00 UTC 2013",
+  "template-opts": {
+    "--arch":    "amd64",
+    "--release": "quantal"
+  }
+}
+```
+
+| KEY             | REQUIRED? | DESCRIPTION |
+| ---             | ---       | ---         |
+| `provider`      | Yes       | Required by Vagrant |
+| `version`       | Yes       | Tracks backward incompatibilities |
+| `built-on`      | No        | Date / time when the box was packaged |
+| `template-opts` | No        | Extra options to be passed to the `lxc-template` script provided with the .box package |