Describe the repository in a README.

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+Many files in this repository are altered versions for configuration files
+autogenerated by services. Their license can depend on the license of the
+service. Therefore, wherever applicable, the license of a file in this repository
+should be the same as the license of the corresponding service. Otherwise, the
+file should be licensed under the 0BSD license which is described below.
+
+BSD Zero Clause License
+
+Copyright (C) 2022-2023 by Jakub Czajka <jakub@ekhem.eu.org>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.

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+server
+======
+
+Configuration files for services deployed on a server. Each directory contains
+files for a single service. For example,
+
+sshd            -- Configuration for the SSH server service.
+|
+|-> README      -- Instructions for working with the service.
+|-> sshd_config -- Configuration of the service.
+`-> ssh.service -- systemd [1] unit file for the service.
+
+[1] systemd :: https://www.freedesktop.org/software/systemd/man/systemd.html