add architecture diagram

[youkaichao]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.94%. Comparing base (dc3f826) to head (0d606ab).
Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   78.94%   78.94%           
=======================================
  Files           4        4           
  Lines        1102     1102           
=======================================
  Hits          870      870           
  Misses        232      232           

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