Update Readme

README.md

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 # Scripts for training Layout Detection Models using Detectron2
 
+## Usage
+
+- In `tools/`, we provide a series of handy scripts for converting data formats and training the models.
+- In `scripts/`, it lists specific command for running the code for processing the given dataset. 
+- The `configs/` contains the configuration for different deep learning models, and is organized by datasets.
 
 ## Reference 
 
-- **[cocosplit](https://github.com/akarazniewicz/cocosplit)**  A script that splits the coco annotations.
+- **[cocosplit](https://github.com/akarazniewicz/cocosplit)**  A script that splits the coco annotations into train and test sets.
+- **[Detectron2](https://github.com/facebookresearch/detectron2)** Detectron2 is Facebook AI Research's next generation software system that implements state-of-the-art object detection algorithms.