Added chabgelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this repository will be documented in this file.
+
+This project uses the following sections:
+- Added
+- Changed
+- Fixed
+- Removed
+- Security
+
+Version bumps and release sections will be created only when explicitly requested
+(e.g. "make a new version" / "make v0.2.0 of Bahmcloud Store").
+
+---
+
+## [Unreleased]
+
+### Added
+- Changelog file for the Bahmcloud Store repository.
+
+### Notes
+- This repository contains the Home Assistant custom component (store UI + API).
+- The Supervisor add-on (installer) is maintained in a separate repository.
+- Public store index (`store.yaml`) is maintained in a separate repository.