Update README.md

README.md

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 ## Data
 Download [data](https://drive.google.com/file/d/1xW-t80cKDMx3ZL-hrRUxlm6QMZIRvUyU/view) from here and unzip to the main folder (i.e. your-path/DCA). 
 
+This data archive contains the following resource files:
+
+- **Dataset**: One in-domain dataset (AIDA-CoNLL) and Five cross-domain datasets (MSNBC/AQUAINT/ACE2004/CWEB/WIKI). These datasets share the same data format.
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+- **Type Embedding**: Used to compute type similarity between mention-entity pairs. These type embedding are trained by a typing system called [NFETC](https://arxiv.org/abs/1803.03378) model.
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+- **Wikipedia inLinks and outLinks**: Surface names of inlinks and outlinks for a Wikipedia page (entity) are used to construct **dynamic context**.
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+
 ## Installation
 
 Requirements: Python 3.5 or 3.6, Pytorch 0.3, CUDA 7.5 or 8