Add changelog

CHANGELOG.md

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+# Change log
+
+## MS2 - 2016-12-09
+
+The goal of the milestone was to have variables and assignments: done
+surprisingly quickly, the rest of the week was spent on setting up continuous
+integration, getting functional tests, getting more fancy tools, working on
+the process. A byproduct was the
+[jacoco-codeclimate-reporter](https://github.com/Botffy/jacoco-codeclimate-reporter)
+script.
+
+### Features
+
+Integer variables, integer literals, assignments.
+
+### Design
+
+- Basic memory model for the interpreter.
+- Localisation
+
+### Refactor
+
+- Rework Lexer to use a proper buffer (instead of lines)
+
+### Tooling
+
+- [Continuous integration](config/ci/README.md) is live.
+- Packaged binaries are built and stored at
+- [users.itk.ppke.hu](http://users.itk.ppke.hu/~sciar/XPLanG/).
+- Test coverage is measured and recorded.
+- Build instructions.
+- Language integration testing.
+
+## [MS1](https://github.com/Botffy/XPLanG/releases/tag/MS1) - 2016-12-04
+
+First milestone, featuring the basic project structure & design, and a
+not very useful language.