Add Security Policy

[denverdino]

Ⅰ. Describe what this PR does

Add security policy statement

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.07%. Comparing base (0f048ec) to head (eaf7169).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #606   +/-   ##
=======================================
  Coverage   80.07%   80.07%           
=======================================
  Files         211      211           
  Lines       15976    15976           
=======================================
  Hits        12793    12793           
  Misses       2715     2715           
  Partials      468      468           

Flag	Coverage Δ
unittests	80.07% <ø> (ø)

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