Add a CHANGELOG

Author: dwayne

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.0.1-alpha.1
+
+### Added
+
+- A format for levels and a way to read them.
+- A runtime environment.
+- A parser for the "h" language.
+- An interpreter.
+- An algorithm to count the number of bytes of a program.
+- An algorithm to calculate the number of points earned by a program when it is
+  run on a given level.
+- A curses user interface.