[DOCS] Add CHANGELOG

[SeungjaeLim]

Description

The project requires a CHANGELOG.md file to document the notable changes and improvements made in each version of the software.

Location

homey/CHANGELOG.md

Proposed Changes

1. Create a CHANGELOG.md file in the root directory of the project.
2. Use a standard format, such as Keep a Changelog, to structure the file.
3. Document the changes made in each version, including new features, bug fixes, improvements, and any breaking changes.
4. Update the CHANGELOG.md file with each new release or significant update.

Additional Context

A well-maintained CHANGELOG.md file helps users and contributors understand the evolution of the project, track changes, and identify updates that might impact their usage or contributions. It is an essential part of transparent and effective project management.