CO2 flux data (fgco2) reading reading

[znicholls]

Pull request

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Example added (either to an existing notebook or as a new notebook, where applicable)
• Description in CHANGELOG.rst added

Adding to CHANGELOG.rst

Please add a single line in the changelog notes similar to one of the following:

- (`#XX <http://link-to-pr.com>`_) Added feature which does something
- (`#XX <http://link-to-pr.com>`_) Fixed bug identified in (`#XX <http://link-to-issue.com>`_)

[codecov]

Codecov Report

Merging #95 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
- Coverage   97.22%   97.21%   -0.01%     
==========================================
  Files          10       10              
  Lines        1478     1474       -4     
  Branches      230      230              
==========================================
- Hits         1437     1433       -4     
  Misses         36       36              
  Partials        5        5

Impacted Files	Coverage Δ
src/netcdf_scm/weights/__init__.py	100% <100%> (ø)	⬆️
src/netcdf_scm/utils.py	100% <100%> (ø)	⬆️
src/netcdf_scm/iris_cube_wrappers.py	99.43% <100%> (-0.01%)	⬇️

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