Update README.md

Author: AnkitBarik

README.md

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 # planetMagFields
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+Interactive visualization and analysis of planetary magnetic fields of the Solar System. Try out the [interactive 3D web app](https://planetmagfields.streamlit.app).
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+[![Streamlit App](https://static.streamlit.io/badges/streamlit_badge_black_white.svg)](https://planetmagfields.streamlit.app)
 ![Build workflow](https://github.com/AnkitBarik/planetMagFields/actions/workflows/main.yml/badge.svg)
 ![Docs](https://github.com/AnkitBarik/planetMagFields/actions/workflows/documentation.yml/badge.svg)
 [![DOI](https://joss.theoj.org/papers/10.21105/joss.06677/status.svg)](https://doi.org/10.21105/joss.06677)