Finalise AboutUs.md

[DingBao-sys]

finalise aboutus.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.26%. Comparing base (f550b96) to head (94bcb62).

❗ Current head 94bcb62 differs from pull request most recent head f22b105. Consider uploading reports for the commit f22b105 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #27   +/-   ##
=========================================
  Coverage     75.26%   75.26%           
  Complexity      419      419           
=========================================
  Files            71       71           
  Lines          1338     1338           
  Branches        126      126           
=========================================
  Hits           1007     1007           
  Misses          301      301           
  Partials         30       30           

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