docs: add credit info to README

README.md

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 # py2spack: Automating conversion of standard python packages to Spack package recipes
 
+Created by David Hofer ([davhofer](https://github.com/davhofer), `davhofer [at] ethz [dot] ch`) during an internship at [CSCS](https://www.cscs.ch/).
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 Github repository for the CSCS internship project with the goal of developing a Python tool for automatically generating Spack package recipes based on existing Python packages, with the ability to handle direct and transitive dependencies and flexible versions.
 
 For more information, see the [Documentation](#Documentation).