Add security policy

[tatiana]

A security policy provides guidelines for evaluating and mitigating security risks.

The idea of a security policy in software is familiar; many large open-source projects understand the need to define policies and procedures for reporting security issues. Some even have dedicated teams to handle security issues. Forges like GitHub actively promote adding a SECURITY.rst or SECURITY.md file in the code repository that explains how to report security issues.

This task aims to add the first version of a security policy for Cosmos, following @jedomagalski's recommendations.

Co-authored-by: Joshua Domagalski [email protected]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.06%. Comparing base (c66681c) to head (24219dd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1385   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
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  Files          67       67           
  Lines        4042     4042           
=======================================
  Hits         3883     3883           
  Misses        159      159           

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