Add 'tutorial'

[Remi-Gau]

taken from
https://lukas-snoek.com/NI-edu/fMRI-introduction/week_3/neurodesign.html

relates to #22

[codecov-commenter]

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Additional details and impacted files

@@            Coverage Diff            @@
##             master      #23   +/-   ##
=========================================
  Coverage          ?   85.56%           
=========================================
  Files             ?        5           
  Lines             ?      845           
  Branches          ?        0           
=========================================
  Hits              ?      723           
  Misses            ?      122           
  Partials          ?        0           

Flag	Coverage Δ
macos-latest_3.10	85.56% <100.00%> (?)
macos-latest_3.11	85.56% <100.00%> (?)
macos-latest_3.12	85.56% <100.00%> (?)
macos-latest_3.8	85.56% <100.00%> (?)
macos-latest_3.9	85.56% <100.00%> (?)
ubuntu-latest_3.10	85.56% <100.00%> (?)
ubuntu-latest_3.11	85.56% <100.00%> (?)
ubuntu-latest_3.12	85.56% <100.00%> (?)
ubuntu-latest_3.8	85.56% <100.00%> (?)
ubuntu-latest_3.9	85.56% <100.00%> (?)
windows-latest_3.10	85.52% <100.00%> (?)
windows-latest_3.11	85.52% <100.00%> (?)
windows-latest_3.12	85.52% <100.00%> (?)
windows-latest_3.8	85.52% <100.00%> (?)
windows-latest_3.9	85.52% <100.00%> (?)

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