Created a changelog, to be used in accordance with http://keepachangelog.com

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
+
+## [Unreleased][unreleased]
+### Changed
+- Iclass read, `hf iclass read` now also reads tag config and prints configuration. (holiman)
+
+### Fixed
+- Fixed issue #19, problems with LF T55xx commands (marshmellow)
+
+### Added
+- Added changelog
+
+## [2.0.0] - 2015-03-25
+### Changed
+- LF sim operations now abort when new commands arrive over the USB - not required to push the device button anymore.
+
+### Fixed
+- Mifare simulation, `hf mf sim` (was broken a long time) (pwpiwi)
+- Major improvements in LF area and data operations. (marshmellow, iceman1001)
+- Issues regarding LF simulation (pwpiwi)
+
+### Added
+- iClass functionality: full simulation of iclass tags, so tags can be simulated with data (not only CSN). Not yet support for write/update, but readers don't seem to enforce update. (holiman).
+- iClass decryption. Proxmark can now decrypt data on an iclass tag, but requires you to have the HID decryption key locally on your computer, as this is not bundled with the sourcecode. 
+
+