Update README.md

Signed-off-by: Paulina Palma-Bifani (she/her) <[email protected]>

README.md

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 <p align="left"><img src="docs/ForMoSA.png" alt="ForMoSA" width="250"/></p>
 
 
+Welcome to ForMoSA, an open-source Python package. 
+We designed this tool to model exoplanetary atmospheres with a forward modeling approach. 
+
+We encourage the community to exploit its capabilities!
+
+Get started at `https://formosa.readthedocs.io <https://formosa.readthedocs.io>`_
 
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