Add info into README

README.md

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 # fxsync-docker
+
+This repository is holding a working docker-compose setup for documentation pourpuses
+because [syncstorage-rs](https://github.com/mozilla-services/syncstorage-rs)'s documentation
+is not very good to explain how to self host the new rust syncserver.
+
+With help of it you can self host the new Firefox sync server, which is written in Rust
+and replaces the old python one, which is deprecated.
+
+## Background
+
+`syncstorage-rs` has a [docker release on docker-hub](https://hub.docker.com/r/mozilla/syncstorage-rs/)
+but it also needs a database to run, which this docker-compose.yaml helps setting up and connecting.
+
+Theoretically you could run Firefox Account yourself, but for login this project relies on the Mozilla
+servers, because setting up and configuring it is quite complex but it does not give much more security.
+
+## Setup
+
+1. Clone this repositoy
+2. Copy .env-example into .env (including the dot at the beginning of the file)
+3. Put in (random) passwords into .env
+4. Put in the domain where you will run your sync server into .env
+5. Setup your reverse proxy server (see nginx-example-com.conf)
+6. Install the systemd service (see fxsync.service) and enable it
+