Add a biplot function to show PCA analysis.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.75000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.80%. Comparing base (45dd167) to head (3b16cda).

Files with missing lines	Patch %	Lines
src/plot.jl	91.48%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1760      +/-   ##
==========================================
- Coverage   85.89%   85.80%   -0.10%     
==========================================
  Files         167      167              
  Lines       23972    24029      +57     
==========================================
+ Hits        20590    20617      +27     
- Misses       3382     3412      +30     

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