**Is your feature request related to a problem? Please describe.** Implement a demo for NER with Streamlit. **Reference** * [An example](https://demo.johnsnowlabs.com/healthcare/NER_CLINICAL/) * [A tutorial](https://nlu.johnsnowlabs.com/docs/en/streamlit_viz_examples) * [spacy-streamlit](https://spacy.io/universe/project/spacy-streamlit)