Add changelog template for project documentation

Author: davisnando

.changes/header.tpl.md

@@ -0,0 +1,6 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
+and is generated by [Changie](https://github.com/miniscruff/changie).