DOC: add matscipy to ecosystem.rst
This merge request adds the matscipy package to the ASE ecosystem list. matscipy is a generic materials science toolbox built around ASE and it is maintained by @pastewka and @jameskermode. We recently published a paper about it, which can be found here.
Thanks a lot and best, Thomas
Checklist
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I am familiar with ASE's contribution guidelines.
Edited by Thomas Reichenbach