Update license

[erquren]

add license

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.48%. Comparing base (1e3fcb9) to head (56746af).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5925       +/-   ##
===========================================
+ Coverage   95.40%   95.48%    +0.08%     
===========================================
  Files         818      405      -413     
  Lines      268459   110508   -157951     
===========================================
- Hits       256111   105522   -150589     
+ Misses      12348     4986     -7362     

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[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[nihui]

Thanks for your contribution !