Add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to the [debpkg project](https://github.com/xor-gate/debpkg) will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased] - 2017-xx-xx
+
+The first release comes with:
+
+* Setting required fields for the control file
+* Adding single files (with optional destination path)
+* Adding directories with files recursivley (destination path is not supported)
+* Adding empty directories
+* Adding control extra files (`preinst`,`postinst`,`prerm`,`postrm`)
+* Compression of the data archive with `tar.gz`
+* Configuring a custom TMPDIR for intermediate files before `New` calls (defaults to OS)
+* Unified configuration file and tool to generate Debian packages