Add docs for setting up Steam Headless on Intel GPU with docker-compose

docs/docker-compose.md

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+# Unraid
+
+Follow these instructions to configure a docker-compose.yml for your system.
+
+> __Note__
+>
+> These instructions assume that you have docker and docker-compose installed for your system.
+> Depending on how you have installed this, the commands to execute docker compose may vary.
+
+
+## PREPARE DIRECTORY:
+
+> __Note__
+>
+> These commands are ment to be run as your user. Do not run them as root. If you do you should manually fix the permissions and ownership after.
+
+Create a directory for your service:
+```
+sudo mkdir -p /opt/container-services/steam-headless
+sudo chown -R $(id -u):$(id -g) /opt/container-services/steam-headless
+```
+
+Create a directory for your service config data:
+```
+sudo mkdir -p /opt/container-data/steam-headless/{home,.X11-unix,pulse}
+sudo chown -R $(id -u):$(id -g) /opt/container-data/steam-headless
+```
+
+Create a Steam Headless docker-compose.yml file:
+```
+touch /opt/container-services/steam-headless/docker-compose.yml
+```
+
+Select from the [COMPOSE FILES](#compose-files) list below the link that best describes your hardware.
+
+Copy the contents of this file to `/opt/container-services/steam-headless/docker-compose.yml`
+
+
+## CONFIGURE ENV:
+
+Create a Steam Headless `/opt/container-services/steam-headless/.env` file with the contents found in this example [Env File](./compose-files/.env).
+
+Edit these variables as requied.
+
+
+## COMPOSE FILES:
+
+- [Intel CPU only](../docker-compose.intel.yml)