dev: start changelog for project

Signed-off-by: John Practicalli <250870+practicalli-john@users.noreply.github.com>

Author: practicalli-johnny

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+### Added
+
+- mkdocs: create new book configuration for Practicalli Learn Clojure
+- ci: add standard Practicalli workflows for book
+- dev: add standard Practicalli Makefile to build & run book locally, check book using MegaLinter
+- mkdocs: Creative Commons Licence
+- mkdocs: git ignore patterns for mkdocs
+- mkdocs: add Google Analytics tag (new property created in Practicalli Websites group)
+- mkdocs: instruct GitHub to skip jekyll post processing of gh-pages content
+
+### Changed
+