Added readme (#1)

Author: damiansteiger

README.rst

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+FermiLib Plugin to interface with PySCF
+=======================================
+
+This repository contains a plugin which allows `FermiLib <http://github.com/ProjectQ-Framework/FermiLib>`__ (licensed under Apache 2) to interface with the open-source quantum chemistry package `PySCF <https://github.com/sunqm/pyscf>`__ (licensed under BSD-2-Clause).
+
+License
+-------
+
+This plugin is released under the Apache 2 license.