feat: add gradio demo notebook

[sayakpaul]

Closes #16.

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[deep-diver]

There are three things to comment:

1. Since we are going to inject which model to use from 🤗 Model Hub, we need to reference a model hosted in 🤗 Model Hub. I have prepared a test repository just now: https://huggingface.co/chansung/test-unet/tree/main.

   • It seems like we can leverate from_pretrained_keras API from huggingface_hug package.

2. In order to generalize a bit, I think it could be better to make labels.txt file while removing def sidewalk_palette() from the code.

3. It would be nice to include a couple of default images to run inference

WDYT?

[sayakpaul]

In order to generalize a bit, I think it could be better to make labels.txt file while removing def sidewalk_palette() from the code.

Sure we can do that when writing code for the Hugging Face space. For a notebook that benefits from interactive usage, I think it would introduce unnecessary back and forth.

I will address rest of the comments tomorrow.

[sayakpaul]

@deep-diver up for another review.

[deep-diver]

LGTM! Thanks for the great work :)