update(docs): document apis

[sumit4613]

Hey, I just made a Pull Request!

Description

This PR documents APIs and closes #47

Motivation and Context

Have you tested this? If so, how?

Checklist for PR author(s)

• Changes are covered by unit tests (no major decrease in code coverage %).
• All tests pass.
• Docstring coverage is 100% via interrogate drf_user (I mean, we should set a good example 😄).
• Updates to documentation:
  • Document any relevant additions/changes in README.md.
  • Manually update both the README.md and docs/index.rst for any new changes.
  • Any changed/added classes/methods/functions have appropriate versionadded, versionchanged, or deprecated directives. Find the appropriate next version in the project's __init__.py file.

Release note

[codecov]

Codecov Report

Merging #56 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #56   +/-   ##
=======================================
  Coverage   91.22%   91.22%           
=======================================
  Files          17       17           
  Lines         638      638           
=======================================
  Hits          582      582           
  Misses         56       56           

Flag	Coverage Δ
#unittests	91.22% <ø> (ø)

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