📝 Add documentation

[DavisDmitry]

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[codecov-commenter]

Codecov Report

Merging #18 (fd5ac10) into master (6a26073) will not change coverage.
The diff coverage is n/a.

❗ Current head fd5ac10 differs from pull request most recent head 5764286. Consider uploading reports for the commit 5764286 to get more accurate results

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   93.45%   93.45%           
=======================================
  Files           7        7           
  Lines         397      397           
=======================================
  Hits          371      371           
  Misses         26       26           

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