Notebook with a simplified implementation for testing and reference purposes

[uellue]

Contributor Checklist:

• [x] I have added myself to the creators.json file
• [N/A] I have added a changelog entry for my contribution
• [x] I have added/updated documentation for all user-facing changes
• [N/A] I have added/updated test cases

[codecov[bot]]

Codecov Report

Merging #43 (01488e1) into master (f64e89a) will decrease coverage by 2.81%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   66.90%   64.08%   -2.82%     
==========================================
  Files           8        8              
  Lines         278      323      +45     
  Branches       29       38       +9     
==========================================
+ Hits          186      207      +21     
- Misses         81      104      +23     
- Partials       11       12       +1     

Impacted Files	Coverage Δ
src/ptychography40/reconstruction/ssb/udf.py	63.20% <0.00%> (-10.61%)	:arrow_down:
src/ptychography40/reconstruction/ssb/trotters.py	65.88% <0.00%> (+1.68%)	:arrow_up:

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[uellue]

Edit: Done! :-)

TODO: include the comment on the NumPy equivalent of the einsum() from the production code!