Add v-1-1 training summary

README.md

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 # Stable Diffusion v1 Model Card
-This model card focuses on the model associated with the Stable Diffusion model v1-1, available [here](https://github.com/CompVis/stable-diffusion).
+
+Stable Diffusion is a latent text-to-image diffusion model capable of generating photo-realistic images given any text input.
+
+The **Stable-Diffusion-v-1-1** was trained on 237,000 steps at resolution `256x256` on [laion2B-en](https://huggingface.co/datasets/laion/laion2B-en), followed by
+194,000 steps at resolution `512x512` on [laion-high-resolution](https://huggingface.co/datasets/laion/laion-high-resolution) (170M examples from LAION-5B with resolution `>= 1024x1024`). For more information, please refer to [Training](#training).
 
 ## Model Details
 - **Developed by:** Robin Rombach, Patrick Esser