introduce CHANGELOG.md file for the python delphi_epidata client (#1290)

* introduce changelog file for the python delphi_epidata client

* pointer to make changelog link show up on our pypi page

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

src/client/packaging/pypi/setup.py

@@ -12,6 +12,9 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/cmu-delphi/delphi-epidata",
+    project_urls={
+        "Changelog": "https://github.com/cmu-delphi/delphi-epidata/blob/dev/src/client/packaging/pypi/CHANGELOG.md",
+    },
     packages=setuptools.find_packages(),
     install_requires=["aiohttp", "requests>=2.7.0", "tenacity"],
     classifiers=[