Update configuration.md

Documentation/configuration.md

@@ -1,5 +1,20 @@
 # Configuration
 
+## USB
+
+You can format a USB stick with FAT32 and name it with `hassos-config`. The layout could be look like:
+```
+network/
+modules/
+known_hosts
+hassos-xy.rauc
+```
+
+- On `network` folder can hold any kind of NetworkManager connections files.
+- The folder `modules` is for modules-load configuration files.
+- `known_hosts` file activate debug SSH access of port `22222`.
+- For firmware updates you can but the `hassos-*.rauc` OTA update they should be install. 
+
 ## Bootargs
 
 You can edit or create a `cmdline.txt` into your boot partition. That will be read from our bootloader.