Tests bissection newton method

[vuille5]

New tests for bissection and newton method in a new folder optim inside the folder tests/utils.

[adrienbanse]

@vuille5 You need to format the code by doing the following

] add JuliaFormatter in your own environment (not Dionysos env), then using JuliaFormatter and finally format(".")

This will uniformize the code you wrote with the writing guidelines precised in ./.JuliaFormatter.toml

[codecov-commenter]

Codecov Report

Merging #324 (722553e) into master (c9f65b3) will not change coverage. The diff coverage is n/a.

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

@@           Coverage Diff           @@
##           master     #324   +/-   ##
=======================================
  Coverage   82.29%   82.29%           
=======================================
  Files          57       57           
  Lines        4270     4270           
=======================================
  Hits         3514     3514           
  Misses        756      756           

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[adrienbanse]

Also @vuille5, you need your tests to be executed, so you have to add it in the ./test/runtests.jl

If you want to first test locally if it works, go to the Dionysos environnement by typing ] activate ., then you should see (Dionysos) in the package manager, then type

] test

This will execute ./test/runtests.jl in the right environmenent. If it fails on the computer it will fail in the Github Actions.