Sex prediction function

[sandrews5]

Functions getSex, plotSex, and addSex and associated man page

[codecov-io]

Codecov Report

Merging #48 into master will decrease coverage by 0.62%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   29.67%   29.04%   -0.63%     
==========================================
  Files          21       22       +1     
  Lines        2639     2696      +57     
==========================================
  Hits          783      783              
- Misses       1856     1913      +57

Impacted Files	Coverage Δ
R/getSex.R	0% <0%> (ø)

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