Add documentation

[amontoison]

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[codecov]

Codecov Report

Merging #4 (acaa195) into main (3ba2575) will not change coverage.
The diff coverage is n/a.

❗ Current head acaa195 differs from pull request most recent head e8e53d5. Consider uploading reports for the commit e8e53d5 to get more accurate results

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   71.42%   71.42%           
=======================================
  Files           1        1           
  Lines         196      196           
=======================================
  Hits          140      140           
  Misses         56       56           

Impacted Files	Coverage Δ
src/BasicLU.jl	71.42% <ø> (ø)

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