docs(docker-compose): Update README.md with example directory structure

docker-compose/{{ cookiecutter.__project_slug }}/README.md

@@ -87,4 +87,38 @@ Create ZFS datasets and set permissions as needed.
 {%- endfor %}
     ```
 
+## Additional files
+
+Place the following files on target server. Use the directory structure at [build-context](build-context) as a guide, specifically at `docker-data`.
+
+```
+build-context/
+{%- if ',' in cookiecutter.__component_list_slug -%}
+{%- set components = cookiecutter.__component_list_slug.split(',') -%}
+{%- for component in components %}
+{%- if not loop.last %}
+├── {{ component }}
+│   ├── docker-data
+│   |   └── config
+│   │       └── {{ component }}.cfg
+│   ├── Dockerfile
+│   └── extras
+{%- else %}
+└── {{ component }}
+    ├── docker-data
+    |   └── config
+    │       └── {{ component }}.cfg
+    ├── Dockerfile
+    └── extras
+{%- endif %}
+{%- endfor %}
+{%- else %}
+├── docker-data
+│   └── config
+│       └── {{ cookiecutter.__service_slug }}.cfg
+├── Dockerfile
+└── extras
+{%- endif %}
+```
+
 When done head back up to [How to run](#how-to-run).