docs: add initial structure, add docs for policies and factors

docs/installation/docker-compose.md

@@ -0,0 +1,26 @@
+# docker-compose
+
+This installation Method is for test-setups and small-scale productive setups.
+
+## Prerequisites
+
+-   docker
+-   docker-compose
+
+## Install
+
+Download the latest `docker-compose.yml` from [here](https://git.beryju.org/BeryJu.org/passbook/raw/master/docker-compose.yml). Place it in a directory of your choice.
+
+passbook needs to know it's primary URL to create links in E-Mails and set cookies, so you have to run the following command:
+
+```
+export PASSBOOK_DOMAIN=domain.tld # this can be any domain or IP, it just needs to point to passbook.
+```
+
+The compose file references the current latest version, which can be overridden with the `SERVER_TAG` Environment variable.
+
+If you plan to use this setup for production, it is also advised to change the PostgreSQL Password by setting `PG_PASS` to a password of your choice.
+
+Now you can pull the Docker images needed by running `docker-compose pull`. After this has finished, run `docker-compose up -d` to start passbook.
+
+passbook will then be reachable on Port 80. You can optionally configure the packaged traefik to use Let's Encrypt for TLS Encryption.