Add changelog

Author: rhpvorderman

CHANGELOG.rst

@@ -0,0 +1,15 @@
+==========
+Changelog
+==========
+
+.. Newest changes should be on top.
+
+.. This document is user facing. Please word the changes in such a way
+.. that users understand how the changes affect the new version.
+
+version 0.1.0-dev
+-----------------
++ Add test suite that tests all possible settings for functions on the
+  isal_zlib module.
++ Create igzip module which implements all gzip functions and methods.
++ Create isal_zlib module which implements all zlib functions and methods.