Add change log

CHANGELOG.markdown

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+# Change Log
+
+## [Unreleased]
+
+### Added
+
+- Add a change log
+
+## [0.0.7] - 2016-03-26
+
+### Changed
+
+- Upgrade to imgui/cimgui 1.47
+
+### Fixed
+
+- Fix issue #17
+
+## [0.0.6] - 2016-01-12
+
+### Changed
+
+- Relicensed to dual MIT/Apache-2.0
+- Upgrade to glium 0.13
+- Upgrade to imgui/cimgui 1.46
+
+## [0.0.5] - 2015-11-30
+
+### Changed
+
+- Upgrade to glium 0.12
+- Upgrade to libc 0.2
+
+## [0.0.4] - 2015-10-26
+
+### Changed
+
+- Upgrade to glium 0.10
+- Lots of other changes
+
+## [0.0.3] - 2015-09-27
+
+### Changed
+
+- Upgrade to glium 0.9
+- Lots of other changes
+
+## [0.0.2] - 2015-08-31
+
+### Changed
+
+- Lots of changes
+
+## 0.0.1 - 2015-08-20
+
+### Added
+
+- Initial release with cimgui/imgui 1.44, glium 0.9
+
+[Unreleased]: https://github.com/Gekkio/imgui-rs/compare/v0.0.7...HEAD
+[0.0.7]: https://github.com/Gekkio/imgui-rs/compare/v0.0.6...v0.0.7
+[0.0.6]: https://github.com/Gekkio/imgui-rs/compare/v0.0.5...v0.0.6
+[0.0.5]: https://github.com/Gekkio/imgui-rs/compare/v0.0.4...v0.0.5
+[0.0.4]: https://github.com/Gekkio/imgui-rs/compare/v0.0.3...v0.0.4
+[0.0.3]: https://github.com/Gekkio/imgui-rs/compare/v0.0.2...v0.0.3
+[0.0.2]: https://github.com/Gekkio/imgui-rs/compare/v0.0.1...v0.0.2