Initial stage of Definition of Done


| - Q. - | - A. - |
| ------ | ------ |
| Tickets | JIRA #CSR-86 |
| Type | Documentation |
| BC breaks? | no |
| Deprecations? | no |
| Docs | new |
| Build | N/A |
| Coverage | N/A |
| Quality | N/A |

Including another file directly is not yet possible, see:
https://github.com/github/markup/issues/346
https://github.com/github/markup/issues/172#issuecomment-33241601