Add a changelog file

Author: guilload

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).
+
+## [Unreleased]
+
+### Added
+- Query validation against index schema before dispatch to leaf nodes (#1109, @linxGnu)
+- Support for custom S3 endpoint (#1108)
+
+### Fixed
+- Minor bug in leaf search stream (#1110)
+
+### Removed
+- QW_ENV environment variable
+
+### Security
+- Compiled binaries with Rust 1.58.1, which fixes CVE-2022-21658
+
+## [0.2.0] - 2022-01-12
+
+## [0.1.0] - 2021-07-13