Added changelog file.

Signed-off-by: Filip Szufnarowski <filip.szufnarowski@intel.com>

CHANGELOG.md

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+# Changelog
+
+This file lists all notable changes in the project per release. It is
+also continously updated with already published but not yet released work.
+
+Release versioning in this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Entries in this file are grouped into several categories:
+
+* Added
+* Changed
+* Deprecated
+* Fixed
+* Removed
+* Security
+
+## [Unreleased]
+
+### Added
+
+* Changelog file ([#167](https://github.com/opiproject/opi-intel-bridge/pull/167)).
+* Documentation with usage examples using OPI commands ([#164](https://github.com/opiproject/opi-intel-bridge/pull/164)).
+* Enablement of QoS on NVMe device level ([#103](https://github.com/opiproject/opi-intel-bridge/pull/103), [#104](https://github.com/opiproject/opi-intel-bridge/pull/104)).
+* Enablement of QoS on volume level ([#92](https://github.com/opiproject/opi-intel-bridge/pull/92)).
+* Enablement of HW-accelerated DARE crypto on volume level ([#79](https://github.com/opiproject/opi-intel-bridge/pull/79), [#84](https://github.com/opiproject/opi-intel-bridge/pull/84)).
+* Dynamic exposition of NVMe storage devices to the host ([#15](https://github.com/opiproject/opi-intel-bridge/pull/15), [#43](https://github.com/opiproject/opi-intel-bridge/pull/43)).
+
+### Security
+
+* Enablement of mTLS-secured gRPC connection between host and IPU ([#165](https://github.com/opiproject/opi-intel-bridge/pull/165)).
+* Hardening of project security through enablement of security scans ([#137](https://github.com/opiproject/opi-intel-bridge/pull/137), [#149](https://github.com/opiproject/opi-intel-bridge/pull/149)).
+
+[unreleased]: https://github.com/opiproject/opi-intel-bridge/