Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/microsoft/layoutlm-base-uncased/README.md

README.md

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+# LayoutLM
+
+## Model description
+
+LayoutLM is a simple but effective pre-training method of text and layout for document image understanding and information extraction tasks, such as form understanding and receipt understanding. LayoutLM archives the SOTA results on multiple datasets. For more details, please refer to our paper: 
+
+[LayoutLM: Pre-training of Text and Layout for Document Image Understanding](https://arxiv.org/abs/1912.13318)
+Yiheng Xu, Minghao Li, Lei Cui, Shaohan Huang, Furu Wei, Ming Zhou, [KDD 2020](https://www.kdd.org/kdd2020/accepted-papers)
+
+## Training data
+
+We pre-train LayoutLM on IIT-CDIP Test Collection 1.0\* dataset with two settings. 
+
+* LayoutLM-Base, Uncased (11M documents, 2 epochs): 12-layer, 768-hidden, 12-heads, 113M parameters **(This Model)**
+* LayoutLM-Large, Uncased (11M documents, 2 epochs): 24-layer, 1024-hidden, 16-heads, 343M parameters
+
+## Citation
+
+If you find LayoutLM useful in your research, please cite the following paper:
+
+``` latex
+@misc{xu2019layoutlm,
+    title={LayoutLM: Pre-training of Text and Layout for Document Image Understanding},
+    author={Yiheng Xu and Minghao Li and Lei Cui and Shaohan Huang and Furu Wei and Ming Zhou},
+    year={2019},
+    eprint={1912.13318},
+    archivePrefix={arXiv},
+    primaryClass={cs.CL}
+}
+```