Add whatsnew PR release note regarding pythonsafepath

Author: algal

docs/source/whatsnew/pr/respect-pythonsafepath.rst

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+Respect PYTHONSAFEPATH
+======================
+
+IPython now respects the value of Python's flag ``sys.flags.safe_path``, a flag which is most often set by the ``PYTHONSAFEPATH`` environment variable. Setting this causes Python not to automatically include the current working directory in the sys.path.
+
+IPython can already be configured to do this via the ``--ignore_cwd`` command-line flag or by setting ``c.InteractiveShellApp.ignore_cwd=True``. Now, IPython can also be configured by setting ``PYTHONSAFEPATH=1`` or by calling python with ``-P``.
+
+The behavior of ``safe_path`` was described in `what's new in 3.11`_ and in `PyConfig docs`_.
+
+
+.. _what's new in 3.11: https://docs.python.org/3/whatsnew/3.11.html#whatsnew311-pythonsafepath
+.. _PyConfig docs: https://docs.python.org/3/c-api/init_config.html#c.PyConfig.safe_path
+
+