feat: add docker compose plugin setup

doc/docker-compose-plugin.md

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+# Setup Docker Compose Plugin
+
+## General
+
+* update your APT cache using
+```
+sudo apt update
+```
+
+## Prerequisites
+
+* install Docker like [this](./docker.md)
+
+## Install Docker Compose Plugin
+
+* install
+```
+sudo apt-get install docker-compose-plugin
+```
+
+* verify installation
+```
+docker compose version
+```
+
+## Links
+
+[Install Docker Compose CLI plugin](https://docs.docker.com/compose/install/compose-plugin/#installing-compose-on-linux-systems)

doc/docker-compose-plugin.md.license

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+/*
+ * SPDX-FileCopyrightText: 2022 Software Ingenieur Begerad <swingbe.de>
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */