update CHANGELOG

Author: joshuadavidthomas

CHANGELOG.md

@@ -18,6 +18,10 @@ and this project attempts to adhere to [Semantic Versioning](https://semver.org/
 
 ## [Unreleased]
 
+### Added
+
+- An number of examples have been added to a new `example` directory. These examples are intended to demonstrate various ways how to use `django-simple-nav` in a Django project and include basic usage and usage with some popular CSS frameworks.
+
 ### Changed
 
 - `check_item_permission` now takes a `request` argument instead of a `user` argument.