add CHANGELOG.md

Author: CodeWithSushil

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+- Initial setup of async HTTP client
+- Support for GET, POST, PUT, PATCH, DELETE
+- Add retries, timeout and stream support
+- Add PSR-7/PSR-18 compatibility
+- Add GitHub Actions for CI and Release automation