feat: add note on generating configuration using InterDiode

Signed-off-by: d9pouces <github@19pouces.net>

README.md

@@ -104,9 +104,10 @@ id-configurator list-modules
 # Same thing, via the Docker image instead of installing anything locally
 docker run --rm \
   -v "$(pwd)/config.yaml:/config.yaml:ro" \
+  -v "$(pwd)/input:/src" \
   -v "$(pwd)/output:/dst" \
   interdiode/id-configurator:latest \
-  id-configurator apply --config /config.yaml --dst /dst
+  id-configurator apply --config /config.yaml --dst /dst --src /src
 ```
 
 The tool can also be invoked as `python -m id_configurator`.