Write CHANGELOG.md

[nohponex]

Use http://keepachangelog.com/ to defined proposed guidelines

[VManolas]

Start CHANGELOG.md like

# Change Log
All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](http://keepachangelog.com/)
and this project adheres to [Semantic Versioning](http://semver.org/).

## xx.yy.zz

??

[nohponex]

yes