Add CHANGELOG and README

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).
+
+## [1.0.0] - 2025-04-09
+### Added
+- Initial release of the `loomlabs/utility.collection` package.
+- Added `Collection` class and essential methods.

README.md

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+# Loom Utilities | Collection
+
+A Collection library for an object-oriented way to work with arrays.
+
+## Installation
+
+```shell
+composer require loomlabs/utility.collection
+```