CHANGELOG.md: add it

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+Group changes to describe their impact on the project, as follows:
+
+    Added for new features.
+    Changed for changes in existing functionality.
+    Deprecated for once-stable features removed in upcoming releases.
+    Removed for deprecated features removed in this release.
+    Fixed for any bug fixes.
+    Security to invite users to upgrade in case of vulnerabilities.
+
+## [Unreleased]
+
+## [3.12.1] - 2016-02-19
+### Changed
+- New About view
+- [plugins registration] procedure has been updated
+- iLBC has been removed - we are now using webrtc implementation instead, which is built by default. Removed libilbc.a from XCode project
+### Fixed
+- reload chat view on iPad on changes
+- remove “invalid length” error in assistant
+- remove comma from user-agent
+- properly display numpad in call
+- update application badge count when answering within notification
+
+## 3.0 - 2016-01-06
+### Added
+- Multi account support
+### Changed
+- New flat design rebranding
+
+## 0.7.6 - 2013-03-04
+### Added
+- Initial version
+
+[Unreleased]: https://github.com/BelledonneCommunications/linphone-iphone/compare/3.12.1...HEAD
+[3.12.1]: http://www.linphone.org/releases/ios/liblinphone-iphone-sdk-3.12.1.zip
+[plugins registration]: https://github.com/BelledonneCommunications/linphone-iphone/blob/3.12.1/Classes/LinphoneManager.m#L1461-L1472