Add JOSS paper

[hajdik]

Purpose

Bring the paper branch into main as the review is nearly complete. Also bump the version and add a metadata file for the zenodo build to pick up on.

Expected time until merged

A day or two so we can do a final proofread

Type of change

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [ ] Maintenance update
• [x] Other (final paper!)

Testing

PDF can be viewed here

Checklist

• [x] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [ ] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #203 (18ef1e8) into main (4f18d04) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #203   +/-   ##
=======================================
  Coverage   64.76%   64.76%           
=======================================
  Files          47       47           
  Lines       12018    12018           
=======================================
  Hits         7783     7783           
  Misses       4235     4235           

Impacted Files	Coverage Δ
pygeo/__init__.py	100.00% <100.00%> (ø)

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