add CHANGELOG

CHANGELOG.md

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+## TBD
+
+Removed:
+
+* Dropped support for PHP 7 (from PHP 7.2 to 7.4).
+* Removed development package _PHP CS Fixer_.
+
+Added:
+
+* Tests and checks under PHP 8.2 and 8.3 via GitHub Actions.
+
+Fixed:
+
+* Fix return type of method _\Swoole\FastCGI\HttpRequest::withBody()_. ([commit](https://github.com/swoole/library/commit/d204c4407357436a73157c454c471916b563ec63))
+* Fix return value of method _\Swoole\Server\Admin::start()_. ([commit](https://github.com/swoole/library/commit/f211ae16cb3075b5977c52d7fd8f4896a8c51dc7))
+* Fix method _\Swoole\MultibyteStringObject::ipos()_. ([commit](https://github.com/swoole/library/commit/3a543c1dc5f116f3fbd96c69b83413193f050086))
+
+Changed:
+
+* Mark method _\Swoole\Coroutine\Barrier::make()_ as deprecated. ([commit](https://github.com/swoole/library/commit/4e2b2b71e49c216833aaebc0c4088731bd95c934))
+* Coding style changes with updated rules of _PHP CS Fixer_.
+* Code quality improvements with _Rector_ and _PHPStan_.
+* Upgrade and improve CI jobs.
+
+## 5.1.1 (2023-11-26)
+
+Built-in PHP library included in [Swoole v5.1.1](https://github.com/swoole/swoole-src/releases/tag/v5.1.1).
+
+## 5.1.0 (2023-09-28)
+
+Built-in PHP library included in [Swoole v5.1.0](https://github.com/swoole/swoole-src/releases/tag/v5.1.0).
+
+## 5.0.3 (2023-04-26)
+
+Built-in PHP library included in [Swoole v5.0.3](https://github.com/swoole/swoole-src/releases/tag/v5.0.3).