Improve documentation

[Arcadia822]

Is your feature request related to a problem? Please describe.
Yes. Lack of document is a problem.

Describe the solution you'd like

• readthedoc.

Describe alternatives you've considered

• docstring auto generation.
• find other solution.

Additional context

[Arcadia822]

Instead of using sphinx. I found another package pdoc which can generate api refenerence documents just from comment string. where is perfect simple and clear.