Document Docker Compose override for Apple M1

docker/DOCKER_MORE_CLOSELY.md

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+# Docker
+
+## Apple M1 Platform
+
+***Attention:** For using Docker commands in Apple M1 environments!*
+
+```bash
+# set env variable for your shell
+$ export DOCKER_DEFAULT_PLATFORM=linux/amd64
+```
+
+For even more informations, see [Docker More Closely](#docker-more-closely)
+
+### Docker Compose Override File For Apple M1 Platform
+
+For Docker compose `up` or `build` commands, you can use our Apple M1 override file that specifies the M1 platform:
+
+```bash
+# in main folder
+
+# for production
+$ docker compose -f docker-compose.yml -f docker-compose.apple-m1.override.yml up
+
+# for production testing Docker images from DockerHub
+$ docker compose -f docker-compose.ocelotsocial-branded.yml -f docker-compose.apple-m1.override.yml up
+
+# only once: init admin user and create indexes and contraints in Neo4j database
+$ docker compose exec backend /bin/sh -c "yarn prod:migrate init"
+```
+
+## Docker More Closely In Main Code
+
+To get more informations about the Apple M1 platform and to analyze the Docker builds etc. you find our documentation in our main code, [here](https://github.com/Ocelot-Social-Community/Ocelot-Social/blob/master/DOCKER_MORE_CLOSELY.md).