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/dbmdz/bert-base-german-cased/README.md

README.md

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+---
+language: de
+license: mit
+---
+
+# 🤗 + 📚 dbmdz German BERT models
+
+In this repository the MDZ Digital Library team (dbmdz) at the Bavarian State
+Library open sources another German BERT models 🎉
+
+# German BERT
+
+## Stats
+
+In addition to the recently released [German BERT](https://deepset.ai/german-bert)
+model by [deepset](https://deepset.ai/) we provide another German-language model.
+
+The source data for the model consists of a recent Wikipedia dump, EU Bookshop corpus,
+Open Subtitles, CommonCrawl, ParaCrawl and News Crawl. This results in a dataset with
+a size of 16GB and 2,350,234,427 tokens.
+
+For sentence splitting, we use [spacy](https://spacy.io/). Our preprocessing steps
+(sentence piece model for vocab generation) follow those used for training
+[SciBERT](https://github.com/allenai/scibert). The model is trained with an initial
+sequence length of 512 subwords and was performed for 1.5M steps.
+
+This release includes both cased and uncased models.
+
+## Model weights
+
+Currently only PyTorch-[Transformers](https://github.com/huggingface/transformers)
+compatible weights are available. If you need access to TensorFlow checkpoints,
+please raise an issue!
+
+| Model                            | Downloads
+| -------------------------------- | ---------------------------------------------------------------------------------------------------------------
+| `bert-base-german-dbmdz-cased`   | [`config.json`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-cased-config.json) • [`pytorch_model.bin`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-cased-pytorch_model.bin) • [`vocab.txt`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-cased-vocab.txt)
+| `bert-base-german-dbmdz-uncased` | [`config.json`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-uncased-config.json) • [`pytorch_model.bin`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-uncased-pytorch_model.bin) • [`vocab.txt`](https://s3.amazonaws.com/models.huggingface.co/bert/bert-base-german-dbmdz-uncased-vocab.txt)
+
+## Usage
+
+With Transformers >= 2.3 our German BERT models can be loaded like:
+
+```python
+from transformers import AutoModel, AutoTokenizer
+
+tokenizer = AutoTokenizer.from_pretrained("dbmdz/bert-base-german-cased")
+model = AutoModel.from_pretrained("dbmdz/bert-base-german-cased")
+```
+
+## Results
+
+For results on downstream tasks like NER or PoS tagging, please refer to
+[this repository](https://github.com/stefan-it/fine-tuned-berts-seq).
+
+# Huggingface model hub
+
+All models are available on the [Huggingface model hub](https://huggingface.co/dbmdz).
+
+# Contact (Bugs, Feedback, Contribution and more)
+
+For questions about our BERT models just open an issue
+[here](https://github.com/dbmdz/berts/issues/new) 🤗
+
+# Acknowledgments
+
+Research supported with Cloud TPUs from Google's TensorFlow Research Cloud (TFRC).
+Thanks for providing access to the TFRC ❤️
+
+Thanks to the generous support from the [Hugging Face](https://huggingface.co/) team,
+it is possible to download both cased and uncased models from their S3 storage 🤗