added more information about package

AUTHORS.md

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+# ogs5py
+
+ogs5py is available on [GitHub](https://github.com/GeoStat-Framework/ogs5py)
+and was created by following people.
+
+
+## Main Authors
+
+- [Sebastian Müller](https://github.com/MuellerSeb), Email:  <sebastian@geostat-framework.org>
+
+
+## Contributors (in order of contributions)
+
+- Falk Heße, Email: <falk.hesse@ufz.de>
+- Miao Jing, Email: <miao.jing@ufz.de>

CONTRIBUTING.md

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+# How to Contribute to ogs5py
+
+We are happy about all contributions! :thumbsup:
+
+
+## Did you find a bug?
+
+- Ensure that the bug was not already reported under
+[GitHub issues](https://github.com/GeoStat-Framework/ogs5py/issues)
+- If the bug wasn't already reported, open a
+[new issue](https://github.com/GeoStat-Framework/ogs5py/issues) with a clear
+description of the problem and if possible with a
+[minimal working example](https://en.wikipedia.org/wiki/Minimal_working_example).
+- please add the version number to the issue:
+
+```python
+import ogs5py
+print(ogs5py.__version__)
+```
+
+
+## Do you have suggestions for new features?
+
+Open a [new issue](https://github.com/GeoStat-Framework/ogs5py/issues)
+with your idea or suggestion and we'd love to discuss about it.
+
+
+## Do you want to enhance GSTools or fix something?
+
+- Fork the repo on [GitHub](https://github.com/GeoStat-Framework/ogs5py).
+- Add yourself to AUTHORS.md (if you want to).
+- We use the black code format, please use the script `black --line-length 79 ogs5py/` after you have written your code.
+- Add some tests if possible.
+- Push to your fork and submit a pull request.

MANIFEST.in

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+include MANIFEST.in
+include setup.py
+recursive-include ogs5py *.py
+recursive-include docs/source *
+include docs/Makefile docs/requirements.txt
+include LICENSE