Add Change Notifications section to CHANGELOG linking to NREL#428 (NREL#106)

Author: softwareengineerprogrammer

CHANGELOG.rst

@@ -176,3 +176,11 @@ as intermediate internal-only patch versions are sometimes introduced during the
 (Improved designation and distribution of releases for public consumption may eventually be addressed by
 `publishing to PyPI <https://github.com/NREL/GEOPHIRES-X/issues/117>`__ and/or use of
 `GitHub releases <https://docs.github.com/en/repositories/releasing-projects-on-github/about-releases>`__.)
+
+Change Notifications
+--------------------
+To receive email notifications of changes:
+
+1. Create or log in to your GitHub account.
+2. Go to the `GEOPHIRES Change Announcements Discussion <https://github.com/NREL/GEOPHIRES-X/discussions/428>`__.
+3. Click the Subscribe button in the Notifications section in the right panel.