Start release notes for 3.5

Author: ferdnyc

docs/change_log/release-3.5.md

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+title: Release Notes for v3.5
+
+# Python-Markdown 3.5 Release Notes
+
+Python-Markdown version 3.5 supports Python versions 3.7, 3.8, 3.9, 3.10,
+3.11 and PyPy3.
+
+## New features
+
+The following new features have been included in the 3.5 release:
+
+* A new configuration option has been added to the
+ [toc](../extensions/toc.md) extension (#1339):
+
+ * A new boolean option `permalink_leading` controls the position of
+ the permanent link anchors generated with `permalink`. Setting
+ `permalink_leading` to `True` will cause the links to be inserted
+ at the start of the header, before any other header content. The
+ default behavior for `permalink` is to append permanent links to
+ the header, placing them after all other header content.