add tutorial (basic numpy-only implementation)

[slayoo]

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[github-actions]

Stale pull request message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.02%. Comparing base (f0cd393) to head (957dc2a).
Report is 34 commits behind head on main.

Additional details and impacted files

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  Coverage   92.02%   92.02%           
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  Files          30       30           
  Lines        1468     1468           
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  Hits         1351     1351           
  Misses        117      117           

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[slayoo]

CC: @emmacware
The convergence exercise is solved here: https://github.com/slayoo/MoAC/blob/master/notebooks/03_MPDATA_error_analysis.ipynb