add demos readme

demos/README.md

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+# FoodVision Demos
+The `.zip` files contained in this folder contain the files for creating the FoodVision Mini and FoodVision Big demos.
+
+The code to create these can be found in 09. PyTorch Model Deployment.
+
+Each `.zip` folder contains: 
+* `model.py` - a file defining the model architecture used for the demo.
+* `app.py` - a file defining the Gradio demo application.
+* `*.pth` - a trained PyTorch model file with the same architecture as in `model.py`.
+* `requirements.txt` - a list of required packages for deploying the app.
+
+You can see a deployed version of each demo on HuggingFace Spaces:
+
+| **App** | **What does it do?** | **Live demo** | **See files** | **Download files** |
+| ----- | ----- | ----- | ----- | ----- |
+| FoodVision Mini 🍕🥩🍣 | Classifies an image of food into pizza, steak or sushi. | [Demo](https://huggingface.co/spaces/mrdbourke/foodvision_mini) | [Files](https://huggingface.co/spaces/mrdbourke/foodvision_mini/tree/main) | [Download `foodvision_mini.zip`](https://github.com/mrdbourke/pytorch-deep-learning/raw/main/demos/foodvision_mini.zip) |
+| FoodVision Big 🍔👁💪 | Classifies an image of food into 101 different food classes from the Food101 dataset. | [Demo](https://huggingface.co/spaces/mrdbourke/foodvision_big/) | [Files](https://huggingface.co/spaces/mrdbourke/foodvision_big/tree/main) | [Download `foodvision_big.zip`](https://github.com/mrdbourke/pytorch-deep-learning/raw/main/demos/foodvision_big.zip) |
+