Add CHANGELOG.md

Author: akondas

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2018-03-15
+### Added
+ - Block structure and hashing
+ - Genesis block
+ - Storing and validate Blockchain
+ - Proof of Work with difficulty (missing consensus on the difficulty)
+ - Communicating with other nodes & controlling the node (based on ReactPHP)
+