updated readme

README.md

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-# SED
+<p align="center"><img src="icons/icon1.png"></p>
 
-Provide a python interface to [LePhare](https://www.cfht.hawaii.edu/~arnouts/LEPHARE/lephare.html) and [Cigale](https://cigale.lam.fr/) SED fitting codes in order to perform resolved SED fitting.
+pixSED is a python library that allows to seamlessly perform pixel-per-pixel SED fitting on multi-band images using already existing SED fitting codes as backend. Currently, both [LePhare](https://www.cfht.hawaii.edu/~arnouts/LEPHARE/lephare.html) and [Cigale](https://cigale.lam.fr/) are supported but [Cigale](https://cigale.lam.fr/) should be preferred.
 
 See the [documentation](https://wilfriedmercier.github.io/SED/) for more details.