Add docstrings to main functions

[vinferrer]

Closes #74 .

Changes proposed in this pull request:

• Add docstring to the different functions

[vinferrer]

Eyy @eurunuela , This doesn't have great priority, however could you add the docstring for the stability lars functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.70%. Comparing base (7e3cc16) to head (c96763d).
Report is 131 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files          15       15           
  Lines         795      795           
=======================================
  Hits          737      737           
  Misses         58       58           

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