introduce changelog file for the python delphi_epidata client

Author: melange396

src/client/packaging/pypi/CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+
+All notable future changes to the `delphi_epidata` python client will be documented in this file.
+The format is based on [Keep a Changelog](http://keepachangelog.com/).
+
+## [4.1.10] - 2023-09-28
+
+### Added
+- Established this Changelog