Add section about architecture to the README

README.md

@@ -6,7 +6,16 @@ mediactl sports a touchscreen that allows control of the media technology in tha
 
 ![Image of the rack](images/rack-perspective.jpg)  
 
-## service
+## architecture
+
+There is a fastapi web service (`localhost:8000`) running behind an nginx reverse proxy that exposes it to the world. The service has a systemd unit file located at `/etc/systemd/system` (see section below).
+The touchpanel is started with raspi-autologin and the `.xinit` file located in the `d0` user directory (see section below). The files of the running webservice are located at `/home/d0/mediactl` (see section below for hints if you want to edit those files).
+
+## autostart on RPI
+See [this](https://blog.r0b.io/post/minimal-rpi-kiosk/) for a description of how to start chromium via `/home/d0/.xinit` – note: this file contains the screen blanking settings (`xset s 600 0` )
+
+
+## systemd service
 
 **Check Service Status**
 ```bash
@@ -20,10 +29,6 @@ sudo systemctl restart mediactl.service
 
 
 
-## autostart on RPI
-
-See [this](https://blog.r0b.io/post/minimal-rpi-kiosk/) for a description of how to start chromium via `/home/d0/.xinit` – note: this file contains the screen blanking settings (`xset 600 0` )
-
 ## note about apt
 
 In `/etc/apt/apt.conf.d/proxy.conf` there is a proxy connection setup: