feat: Add changelog file

CHANGELOG.md

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+# Changelog
+
+All notable changes to the Binaural Rendering Toolbox (BRT) will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [1.3.1] - 2024-03-19
+
+### Fixed
+
+- To avoid errors, it is checked, when loading a SOFA file of HRTFs, that the IRs are at a distance greater than zero. 
+- Fixes error that occur when loading an HRTFs SOFA file that only contains IRs in an azimuth ring.
+- Fixed listener configuration loss when deleting all present sources.
+- The near field compensation crossfading process is reset when the processor is reset.
+- Crossfading process of the near field compensation is now not applied in the first buffer.
+- A number of minor errors have been resolved.
+
+### Changed
+
+- ILD class has been renamed to NearFieldCompensationFilters.