Add documentation

[TaiSakuma]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 93.09%. Comparing base (722fc18) to head (8156937).

Files	Patch %	Lines
examples/guide/multiprocessing_pool.py	84.61%	2 Missing ⚠️
examples/guide/thread_pool_executor.py	84.61%	2 Missing ⚠️
examples/guide/threading_thread.py	88.23%	2 Missing ⚠️
examples/quick.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   93.12%   93.09%   -0.03%     
==========================================
  Files          50       50              
  Lines        2065     2043      -22     
  Branches      292      296       +4     
==========================================
- Hits         1923     1902      -21     
+ Misses        119      118       -1     
  Partials       23       23              

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