Add changelog

CHANGELOG.md

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+# Change Log
+
+Notable changes are logged here by release. This project is not
+expected to be especially active and follows a simplified Semantic Versioning:
+
+- Version numbers take the format X.Y
+- X is associated with major API breakage / changes in algorithm and results.
+- Y is associated with minor updates and improvements
+- Small amounts of code tidying, refactoring and documentation do not
+  lead to a new release, and simply sit on the Development branch of
+  the Git repository.
+
+The changelog format is inspired by [keep-a-changelog](https://github.com/olivierlacan/keep-a-changelog).
+
+## [Unreleased]
+
+
+## [0.2] - 2016-07-28
+
+### Added
+- Present useful Python API for use with [Atomic Simulation Environment (ASE)](https://wiki.fysik.dtu.dk/ase/) calculators
+
+### Changed
+- Import routine uses [Atomic Simulation Environment](https://wiki.fysik.dtu.dk/ase/). This adds a
+  dependency, but permits import of almost any major crystal structure
+  file format.
+
+## 0.1 - 2013-06-01
+
+### Added
+- Basic codebase reading from FHI-aims input files
+- Optparse-based interface
+- GPL
+
+[Unreleased]: http://github.com/wmd-group/kgrid/compare/v0.2...HEAD
+[0.2]: http://github.com/wmd-group/kgrid/compare/v0.1...v0.2