Update README.md

fixed floorplan generate command example

README.md

@@ -11,7 +11,7 @@ pip install -e .
 This module adds `floorplan` as a command line interface. You can use the `generate` command as shown below:
 
 ```shell
-floorplan generate <path to config file> <path to input folder>
+floorplan generate <path to config file> -i <path to input folder>
 ```
 
 Where the input folder must contain:
@@ -59,4 +59,4 @@ This work is part of a project that has received funding from the European Union
 <p align="center">
     <img src="docs/images/EU.jpg" alt="drawing" height="100"/>
     <img src="docs/images/SESAME.jpg" alt="drawing" height="100"/>
-</p>
+</p>