test: add a subplot to verify the roles work

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+# Introduction
+
+`debian-ansible` is a collection of Ansible roles for managing Debian
+systems. The roles are re-usable and parameterised so that they can be
+adapted to some variations.
+
+This document describes the roles and also acts as an acceptance test
+suite for them. The [Subplot][] program can generate a test program
+based on this document, and the test program tests that the roles work
+as intended.
+
+[Subplot]: https://subplot.liw.fi/
+
+## Source files
+
+At the root of the `debian-ansible` source tree is a `subplot.md`, and
+the subdirectory `subplot` with some other files used by the main
+file. Each role directory should have a `subplot.md`, and may also
+have `subplot.yaml` and `subplot.py`. The files in role directories
+get combined with the main ones the the `./check` script.
+
+## Scenario structure
+
+Each `subplot.md` file is meant to contain at least one scenario. All
+scenarios have the same structure:
+
+* create a new VM
+* construct an Ansible playbook that uses the role in a specific way
+* run the playbook against the VM
+* examine the VM to verify it has been changed in the expected way
+
+The VM is created using a base image, which the user must specify to
+the test program by setting the `BASEIMAGE` environment variable.
+
+## Sanity check
+
+Verify that everything looks OK and that other scenarios can be run.
+
+~~~scenario
+given a host running Debian
+then I can run /bin/true on the host
+~~~
+
+
+
+---
+title: "debian-ansible—Ansible roles for Debian systems"
+author: Lars Wirzenius
+bindings: 
+- subplot.yaml
+functions:
+- subplot.py
+...