Dev (#22)

* update .zenodo.json

* add workflow to validate .zenodo.json

* style: pre-commit fixes

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

updates to template and instructions (#1)

Change the default from `packagename` to `samplepackagename` which is available on `PyPI`. 
Also adds some additional files which were missing, such as `.git_archival.txt`,  `ISSUE_TEMPLATES` for GitHub issues, and `CHANGELOG.md`.
More detailed instructions on how to use the template and how contributors can contribute to the created package.