Add tutorial on fitting magnetic nanoparticles

[henrikjacobsenfys]

Would be good if someone can run it and tell me if the explanations make sense. It does to some extent expect people to have run tutorial 1.

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@d59da80). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/easydynamics/experiment/experiment.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #127   +/-   ##
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  Coverage           ?   97.58%           
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  Files              ?       37           
  Lines              ?     2482           
  Branches           ?      421           
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  Hits               ?     2422           
  Misses             ?       36           
  Partials           ?       24           

Flag	Coverage Δ
integration	0.00% <0.00%> (?)
unittests	97.58% <89.47%> (?)

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