Docs: Add method documentation

[SchoolGuy]

Fixes #22

This PR is adding documentation to all public client methods and structs. The documentation can be seen locally with:

go install golang.org/x/pkgsite/cmd/pkgsite@latest & pkgsite

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +5.94% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a7e3844)	2059	923	44.83%
Head commit (da16953)	1818 (-241)	923 (+0)	50.77% (+5.94%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#25)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.05% (target: -1.00%)	✅ 66.67%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a7e3844)	2059	923	44.83%
Head commit (b8a5edd)	2061 (+2)	925 (+2)	44.88% (+0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#25)	3	2	66.67%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

_{Codacy will stop sending the deprecated coverage status from June 5th, 2024. Learn more}

[tiltingpenguin]

After my fixes everything LGTM, but ideally someone should have another look