Create CHANGELOG.md

Author: m074554n

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/).
+
+## [Unreleased]
+
+## [v0.1.0-beta.1] – 2025-08-10
+
+### Added
+- **SingleDailySlotStrategy** returning `Collection<Slot>` for date-based availability.
+- **Slot** value object (`start`, `end`) with helpers: `toArray`, `toJson`, `toCarbonPeriod`, `toLeaguePeriod`, `durationInMinutes`, `overlaps`.
+- The `HasBookings` to allow Bookable entities to manage bookings.
+- Basic **PHPUnit** test setup and unit tests for `Slot` and `SingleDailySlotStrategy`.