Add CHANGELOG.md

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Fixed
+
+- Fixes [#35](https://github.com/team-charls/charls/issues/35), Encoding will fail if the bit per sample is greater than 8, and a custom RESET value is used
+
+## [2.0.0] - 2016-5-18
+
+### Changed
+
+- Updated the source code to C++14
+- Refactored several APIs to make usage of the library easier
+
+### Fixed
+
+- Fixes [#10](https://github.com/team-charls/charls/issues/10), Fixed the problem that "output buffer to small" was not detected when writting encoded bytes to a fixed output buffer. This could cause memory corruption problems
+- Fixes [11](https://github.com/team-charls/charls/issues/11), Update charlstest to return EXIT_SUCCESS/FAILURE
+- Fixed the issue that DecodeToPnm would set params.colorTransform = ColorTransformation::BigEndian but the library didn’t support this option during decoding
+
+## [1.1.0] - 2016-5-15
+
+### Fixed
+
+- Fixes [#9](https://github.com/team-charls/charls/issues/9) EncoderStrategy::AppendToBitStream method fails if buffer is full, 31 bits are added and xFF bytes are written
+
+## [1.0.0] - 2010-11-18
+
+First release of the CharLS JPEG-LS codec.