Diffpy.snmf

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**Fixed:**

* Updated REAMDE instructions for pip and conda-forge install
* Updated REAMDE instructions to check for successful installation

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**Added:**

* Use GitHub Actions to build, release, upload to PyPI
* Added issue template for PyPI/GitHub release

**Changed:**

* Added tag check for release
* citation from arXiv to npj Comput Mater in docs

**Fixed:**

* Python version from 3.9 to 3.12 in CI news item
* tests folder at the root of the repo
* re-cookiecuter repo to groupd's package standard
* Add pip dependencies under pip.txt and conda dependencies under conda.txt

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**Added:**

* Initial release of diffpy.snmf

**Changed:**

* Support Python version 3.12
* Remove support for Python version 3.9

**Fixed:**

* Repo structure modified to the new diffpy standard
* Code linting based on .pre-commit-config.yaml