Create CHANGELOG.md

Signed-off-by: Nathanael Esayeas <nathanael.esayeas@protonmail.com>

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/)
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+## [2.0.0] - 2024-02-22
+
+### Added
+
+- Class `Ghostwriter\Collection\Interface\CollectionInterface` has been added
+- Class `Ghostwriter\Collection\Interface\ExceptionInterface` has been added
+- Method `Ghostwriter\Collection\Collection::from()` was added
+- Method `Ghostwriter\Collection\Collection::new()` was added
+
+### Removed
+
+- Class `Ghostwriter\Collection\ExceptionInterface` has been deleted
+- Method `Ghostwriter\Collection\Collection::fromGenerator()` was removed
+- Method `Ghostwriter\Collection\Collection::fromIterable()` was removed
+
+### Changed
+
+- Exception class `Ghostwriter\Collection\Exception\FirstValueNotFoundException` implements `Ghostwriter\Collection\Interface\ExceptionInterface`
+- Exception class `Ghostwriter\Collection\Exception\LengthMustBePositiveIntegerException` implements `Ghostwriter\Collection\Interface\ExceptionInterface`
+- Exception class `Ghostwriter\Collection\Exception\OffsetMustBePositiveIntegerException` implements `Ghostwriter\Collection\Interface\ExceptionInterface`