Add Changelog

CHANGELOG.md

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+# 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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+[//]: <> (Unreleased)
+
+## [0.5.0] - 2019-09-19
+### Added
+
+Features described in [\#7125](https://redmine.ungleich.ch/issues/7125)
+
+- Users (inlcuding anonymous users) can list products
+- Authenticated users (with valid credentials) can:
+    - register a payment method
+    - make an order
+    - list their orders
+- Admin user can create products