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/jplu/tf-camembert-base/README.md

README.md

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+# Tensorflow CamemBERT
+
+In this repository you will find different versions of the CamemBERT model for Tensorflow.
+
+## CamemBERT
+
+[CamemBERT](https://camembert-model.fr/) is a state-of-the-art language model for French based on the RoBERTa architecture pretrained on the French subcorpus of the newly available multilingual corpus OSCAR.
+
+## Model Weights
+
+| Model                            | Downloads
+| -------------------------------- | ---------------------------------------------------------------------------------------------------------------
+| `jplu/tf-camembert-base`   | [`config.json`](https://s3.amazonaws.com/models.huggingface.co/bert/jplu/tf-camembert-base/config.json) • [`tf_model.h5`](https://s3.amazonaws.com/models.huggingface.co/bert/jplu/tf-camembert-base/tf_model.h5)
+
+## Usage
+
+With Transformers >= 2.4 the Tensorflow models of CamemBERT can be loaded like:
+
+```python
+from transformers import TFCamembertModel
+
+model = TFCamembertModel.from_pretrained("jplu/tf-camembert-base")
+```
+
+## Huggingface model hub
+
+All models are available on the [Huggingface model hub](https://huggingface.co/jplu).
+
+## Acknowledgments
+
+Thanks to all the Huggingface team for the support and their amazing library!