Create ReadTheDoc documentation

[Galileo-Galilei]

This PR intends to :

• add * a lot* of documentation, divide it in section and make it easier to grasp for beginners
• add the ReadTheDocs setup to publish this documentation to new users and make it more discoverable, especially when cherching on Google
• I also plan to simplify the Readme a lot, but maybe this will be for another PR

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.65%. Comparing base (b9cd2d0) to head (ea3ff33).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #35   +/-   ##
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  Coverage   59.65%   59.65%           
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  Files          26       26           
  Lines         865      865           
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  Hits          516      516           
  Misses        349      349           

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