Adding a model card

Need to update for the specifics of DALL E Mini; for now, this just gets in place the basics from the original.

README.md

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+# Model Card: DALL·E Mini
+
+This model is a reproduction of OpenAI’s DALL·E.  Please see [this link](https://wandb.ai/dalle-mini/dalle-mini/reports/DALL-E-Mini-Explained-with-Demo--Vmlldzo4NjIxODA) for project-specific details.  Below, we include the original DALL·E model card available on [the OpenAI github](https://github.com/openai/DALL-E/edit/master/model_card.md).
+
+## Model Details
+
+The dVAE was developed by researchers at OpenAI to reduce the memory footprint of the transformer trained on the text-to-image generation task. The details involved in training the dVAE are described in [the paper][dalle_paper]. This model card describes the first version of the model, released in February 2021. The model consists of a convolutional encoder and decoder whose architectures are described [here](dall_e/encoder.py) and [here](dall_e/decoder.py), respectively. For questions or comments about the models or the code release, please file a Github issue.
+
+# Model Use
+
+## Intended Use
+
+The model is intended for others to use for training their own generative models.
+
+## Out-of-Scope Use Cases
+
+This model is inappropriate for high-fidelity image processing applications. We also do not recommend its use as a general-purpose image compressor.
+
+# Training Data
+
+The model was trained on publicly available text-image pairs collected from the internet. This data consists partly of [Conceptual Captions][cc] and a filtered subset of [YFCC100M][yfcc100m]. We used a subset of the filters described in [Sharma et al.][cc_paper] to construct this dataset; further details are described in [our paper][dalle_paper]. We will not be releasing the dataset.
+
+# Performance and Limitations
+
+The heavy compression from the encoding process results in a noticeable loss of detail in the reconstructed images. This renders it inappropriate for applications that require fine-grained details of the image to be preserved.
+
+[dalle_paper]: https://arxiv.org/abs/2102.12092
+[cc]: https://ai.google.com/research/ConceptualCaptions
+[cc_paper]: https://www.aclweb.org/anthology/P18-1238/
+[yfcc100m]: http://projects.dfki.uni-kl.de/yfcc100m/