[7.1.x] Docs: link to easy issues in contributing guide

Author: nicoddemus

CONTRIBUTING.rst

@@ -50,6 +50,8 @@ Fix bugs
 --------
 
 Look through the `GitHub issues for bugs <https://github.com/pytest-dev/pytest/labels/type:%20bug>`_.
+See also the `"status: easy" issues <https://github.com/pytest-dev/pytest/labels/status%3A%20easy>`_
+that are friendly to new contributors.
 
 :ref:`Talk <contact>` to developers to find out how you can fix specific bugs. To indicate that you are going
 to work on a particular issue, add a comment to that effect on the specific issue.