Update README.md

README.md

@@ -58,6 +58,7 @@ The standard metric for text-based VQA tasks (ST-VQA and DocVQA). It evaluates t
 Check [Scene Text Visual Question Answering](https://arxiv.org/abs/1905.13648) for detailed information.
 
 **Answer Page Prediction Accuracy (APPA)**
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 In the MP-DocVQA task, the models can provide the index of the page where the information required to answer the question is located. For this subtask accuracy is used to evaluate the predictions: i.e. if the predicted page is correct or not.
 Check [Hierarchical multimodal transformers for Multi-Page DocVQA](https://arxiv.org/abs/2212.05935) for detailed information.