Document CI-related processes

Author: ForNeVeR

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+<!--
+SPDX-FileCopyrightText: 2025 Friedrich von Never <friedrich@fornever.me>
+
+SPDX-License-Identifier: MIT
+-->
+
+Contributor Guide
+=================
+
+License Automation
+------------------
+<!-- REUSE-IgnoreStart -->
+If the CI asks you to update the file licenses, follow one of these:
+1. Update the headers manually (look at the existing files), something like this:
+   ```
+   # SPDX-FileCopyrightText: %year% %your name% <%your contact info, e.g. email%>
+   #
+   # SPDX-License-Identifier: MIT
+   ```
+   (accommodate to the file's comment style if required).
+2. Alternately, use the [REUSE][reuse] tool:
+   ```console
+   $ reuse annotate --license MIT --copyright '%your name% <%your contact info, e.g. email%>' %file names to annotate%
+   ```
+
+(Feel free to attribute the changes to "codingteam/devops contributors <https://github.com/codingteam/devops>"
+instead of your name in a multi-author file,
+or if you don't want your name to be mentioned in the project's source: this doesn't mean you'll lose the copyright.)
+<!-- REUSE-IgnoreEnd -->
+
+[reuse]: https://reuse.software/

Readme.md

@@ -22,15 +22,25 @@ Host specification
 - [cthulhu-3][hosts/cthulhu-3]
 - [omnissiah][hosts/omnissiah]
 
-[hosts/ctor]: ctor/Host.md
-[hosts/cthulhu-3]: cthulhu-3/Host.md
-[hosts/omnissiah]: omnissiah/Host.md
-[schematic]: docs/devops.png
+Documentation
+-------------
+- [Contributor Guide][docs.contributing]
 
+License
+-------
+The project is distributed under the terms of [the MIT license][docs.license].
+
+The license indication in the project's sources is compliant with the [REUSE specification v3.3][reuse.spec].
+
+[badge-xmpp.net]: https://xmpp.net/badge.php?domain=codingteam.org.ru
 [codingteam.org.ru]: https://codingteam.org.ru
 [devops]: https://ru.wikipedia.org/wiki/DevOps
+[docs.license]: LICENSES/MIT.txt
+[hosts/cthulhu-3]: cthulhu-3/Host.md
+[hosts/ctor]: ctor/Host.md
+[hosts/omnissiah]: omnissiah/Host.md
 [issues]: https://github.com/codingteam/devops/issues
 [loglist.xyz]: https://loglist.xyz
+[reuse.spec]: https://reuse.software/spec-3.3/
+[schematic]: docs/devops.png
 [xmpp.net]:  https://xmpp.net/result.php?domain=codingteam.org.ru&type=client
-
-[badge-xmpp.net]: https://xmpp.net/badge.php?domain=codingteam.org.ru