Add JOSS paper folder and files

[aleicazatti]

Description

Add JOSS paper folder and files

[codecov-commenter]

Codecov Report

Merging #213 (89389d2) into main (a216518) will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   83.75%   84.02%   +0.26%     
==========================================
  Files          26       26              
  Lines        3023     3080      +57     
==========================================
+ Hits         2532     2588      +56     
- Misses        491      492       +1     

Impacted Files	Coverage Δ
preliz/internal/optimization.py	98.73% <0.00%> (-1.27%)	⬇️
preliz/predictive/ppa.py	10.45% <0.00%> (ø)
preliz/tests/test_mle.py	100.00% <0.00%> (ø)
preliz/tests/test_maxent.py	100.00% <0.00%> (ø)
preliz/tests/test_quartile.py	100.00% <0.00%> (ø)
preliz/distributions/__init__.py	100.00% <0.00%> (ø)
preliz/distributions/continuous.py	92.97% <0.00%> (+<0.01%)	⬆️
preliz/distributions/discrete.py	93.75% <0.00%> (+0.56%)	⬆️
preliz/unidimensional/maxent.py	82.50% <0.00%> (+2.50%)	⬆️

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[aloctavodia]

Do we need to add this https://github.com/marketplace/actions/open-journals-pdf-generator? or are we going to compile it locally?