update readme

[eeliu]

Describe your changes

why we need this pr?

update readme

Issue ticket number and link

if it has issues, add them

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics?
• Will this be part of a product update? If yes, please write one phrase about this update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (5187cc0) to head (e86a5a1).
Report is 21 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #661      +/-   ##
==========================================
- Coverage   80.79%   80.63%   -0.16%     
==========================================
  Files          22       22              
  Lines        1536     1539       +3     
  Branches      165      166       +1     
==========================================
  Hits         1241     1241              
- Misses        162      164       +2     
- Partials      133      134       +1     

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