Update README.md

README.md

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 > Binarization for document images
 
 ## Introduction
-This tool performs document image binarization for OCR using a trained model.
+This tool performs document image binarization (i.e. transform colour/grayscale to black-and-white pixels) for OCR using multiple trained models.
 
 ## Installation
+Clone the repository, enter it and run  
 `./make`
 
 ### Models
-Pretrained models can be downloaded from here:   
+Pre-trained models can be downloaded from here:   
 https://qurator-data.de/sbb_binarization/
 
 ## Usage 
-`sbb_binarize -m <directory of models> -i <image> 
+`sbb_binarize -m <directory with models> -i <image file> 
--p <set to true in order to let the model see image in patches> 
+-p <set to true to let the model see the image divided into patches> 
--s <provide a directory with a given ouput name and format. The result will be saved here.>`
+-s <directory where the results will be saved>`