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/deepset/gelectra-base-generator/README.md

README.md

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+---
+language: de
+license: mit
+datasets:
+- wikipedia
+- OPUS
+- OpenLegalData
+---
+
+# German ELECTRA base generator
+
+Released, Oct 2020, this is the generator component of the German ELECTRA language model trained collaboratively by the makers of the original German BERT (aka "bert-base-german-cased") and the dbmdz BERT (aka bert-base-german-dbmdz-cased). In our [paper](https://arxiv.org/pdf/2010.10906.pdf), we outline the steps taken to train our model.
+
+The generator is useful for performing masking experiments. If you are looking for a regular language model for embedding extraction, or downstream tasks like NER, classification or QA, please use deepset/gelectra-base.
+
+## Overview  
+**Paper:** [here](https://arxiv.org/pdf/2010.10906.pdf)  
+**Architecture:** ELECTRA base (generator)
+**Language:** German  
+
+See also:  
+deepset/gbert-base
+deepset/gbert-large
+deepset/gelectra-base
+deepset/gelectra-large
+deepset/gelectra-base-generator
+deepset/gelectra-large-generator
+
+## Authors
+Branden Chan: `branden.chan [at] deepset.ai`
+Stefan Schweter: `stefan [at] schweter.eu`
+Timo Möller: `timo.moeller [at] deepset.ai`
+
+## About us
+![deepset logo](https://raw.githubusercontent.com/deepset-ai/FARM/master/docs/img/deepset_logo.png)
+
+We bring NLP to the industry via open source!  
+Our focus: Industry specific language models & large scale QA systems.  
+  
+Some of our work: 
+- [German BERT (aka "bert-base-german-cased")](https://deepset.ai/german-bert)
+- [FARM](https://github.com/deepset-ai/FARM)
+- [Haystack](https://github.com/deepset-ai/haystack/)
+
+Get in touch:
+[Twitter](https://twitter.com/deepset_ai) | [LinkedIn](https://www.linkedin.com/company/deepset-ai/) | [Website](https://deepset.ai)