docs: add docs (close #36)

[Mister-Hope]

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[coveralls]

Pull Request Test Coverage Report for Build 7708742310

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
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A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.2%) to 73.055%

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Totals
Change from base Build 7696095881:	-2.2%
Covered Lines:	279
Relevant Lines:	362

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💛 - Coveralls