Update README.md

Model description, how to use and references

README.md

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+tags:
+- Pytorch
 license: apache-2.0
+datasets:
+- Publaynet
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+
+
+# Detectron2 Cascade-RCNN with FPN and Group Normalization on ResNext32xd4-50 trained on Publaynet for Document Layout Analysis
+
+The model and has been trained with the Tensorflow training toolkit Tensorpack and then transferred to Pytorch using a conversion script. 
+The Tensorflow and Pytorch models differ slightly (padding ...), however validating the both models give and difference of < 0.03 mAP.   
+
+Please check: [Xu Zhong et. all. - PubLayNet: largest dataset ever for document layout analysis](https://arxiv.org/abs/1908.07836). 
+
+This model is different from the model used the paper. 
+
+The code has been adapted so that it can be used in a **deep**doctection pipeline. 
+
+## How this model can be used
+
+This model can be used with the **deep**doctection in a full pipeline, along with table recognition and OCR. Check the general instruction following this [Get_started](https://github.com/deepdoctection/deepdoctection/blob/master/notebooks/Get_Started.ipynb) tutorial.
+
+  
+## This is an inference model only
+
+To reduce the size of the checkpoint we removed all variables that are not necessary for inference. Therefore it cannot be used for fine-tuning. To fine tune this model please use Tensorflow, as well as its training script. More information can be found in this [this model card](https://huggingface.co/deepdoctection/tp_casc_rcnn_X_32xd4_50_FPN_GN_2FC_publaynet). 
+