README.md updated

README.md

@@ -28,10 +28,14 @@ pip install moviepy
 ```
 
 ## Usage
-Once the libraries are installed, you can launch the Packager from the command line with:
+Once the libraries are installed, you should customise the configuration file `config.yaml`.
+There are two required parameters, `INPUT_PATH` and `OUTPUT_PATH` that specifies where all input files are stored and where output files shall be saved.
+
+You can now launch the Packager from the command line with:
 ```
 python3 main.py
 ```
+Useful log information will be displayed during execution, requiring occasional interaction.
 
 ## Support
 If you have any problem you can contact us at: