Add security policy

[shamaton]

• Request: private channel for reporting a security issue #106

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.57%. Comparing base (68e8165) to head (9b5dfee).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          73       73           
  Lines        6366     6366           
=======================================
  Hits         6084     6084           
  Misses        167      167           
  Partials      115      115           

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