DOC: Add security policy (#54060)

DOC: Add security policy.

Signed-off-by: Liang Yan <[email protected]>

Author: liang3zy22

Diff for: doc/source/development/policies.rst

@@ -51,5 +51,9 @@ Python support
 
 pandas mirrors the `NumPy guidelines for Python support <https://numpy.org/neps/nep-0029-deprecation_policy.html#implementation>`__.
 
+Security policy
+~~~~~~~~~~~~~~~
+
+To report a security vulnerability to pandas, please go to https://github.com/pandas-dev/pandas/security/policy and see the instructions there.
 
 .. _SemVer: https://semver.org