chores: add openssf best practices badge into README

[songtao98]

Ⅰ. Describe what this PR does

This PR added the OpenSSF Best Practices Badge in README files.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.80%. Comparing base (3b6167d) to head (c72ade5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2023   +/-   ##
=======================================
  Coverage   68.80%   68.80%           
=======================================
  Files         422      422           
  Lines       39061    39061           
=======================================
  Hits        26877    26877           
  Misses       9862     9862           
  Partials     2322     2322           

Flag	Coverage Δ
unittests	68.80% <ø> (ø)

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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