Prepare instruction and example how to train and submit trained model to HF

[laugustyniak]

We can easily train a custom model based on static embedding or LM. However, we also want to showcase how to train and upload it to the HF hub. We can also generate a streamlit app to showcase how it works and add it to HF spaces.

• a jupyter notebook with training a model in our library and submit trained model to HF Hub
• create streamlit/HF spaces with loading a model and inference on custom examples https://huggingface.co/spaces