Add documentation for Swoole context.

[anoxia]

Include both Chinese and English documentation.

[anoxia]

@brettmc The usage documentation you mentioned earlier. 😄 #209

[codecov]

Codecov Report

Merging #216 (a4eb463) into main (0dda869) will increase coverage by 53.67%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #216       +/-   ##
=============================================
+ Coverage     32.17%   85.85%   +53.67%     
  Complexity      883      883               
=============================================
  Files            80       80               
  Lines          3391     3393        +2     
=============================================
+ Hits           1091     2913     +1822     
+ Misses         2300      480     -1820     

Flag	Coverage Δ
7.4	85.63% <ø> (+38.90%)	⬆️
8.0	85.23% <ø> (+53.20%)	⬆️
8.1	85.10% <ø> (+53.04%)	⬆️
8.2	85.72% <ø> (+53.60%)	⬆️

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see 36 files with indirect coverage changes

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[brettmc]

Thanks, @anoxia :)